Interaction term stata

Interaction Terms in STATA. Tommie Thompson: Georgetown MPP 2018. In regression analysis, it is often useful to include an interaction term between different variables. For instance, when testing how education and race affect wage, we might want to know if educating minorities leads to a better wage boost than educating Caucasians Edit: just to explain a little about the #, if you add var1#var2 in a regression, stata will only add the interaction term. The neat trick is that when you instead add var1##var2, stata will include the two variables as well as their interaction. That's just a side note but it might be useful later on My question concerns the proper use of # versus ## in Stata for interacting categorical and dependent variables. Here is the example I have in mind. To understand the marginal effect of x on y I ran an experiment with three treatments (A, B, C) on two types of subjects (M, F).To understand the pooled marginal effect (and supposing I satisfy all OLS criteria) I can run reg y x

  1. Graphing ANOVA Interaction Effects. The easiest way to see interaction effects with ANOVAs is to graph them. If you are working with a one-, two- or three-way interaction, you can use the user-created command anovaplot otherwise (or instead) you can use Stata's existing commands (though this may be a bit more complex). The instructions below will use anovaplot and then Stata's existing commands
  2. The standardized interaction term should be the standardized version of the product of the two original variables, not the product of the two standardized variables. Here is an example using the sample data set auto in Stata
  3. Interaction effects between continuous variables (Optional) Page 2 • In models with multiplicative terms, the regression coefficients for X1 and X2 reflect . conditional . relationships. B1 is the effect of X1 on Y when X2 = 0. Similarly, B2 is the effect of X2 on Y when X1 = 0. For example, when X2 = 0, we get α β ε α β β β ε α β.
  4. 2000 that used interaction terms in nonlinear models (Ai and Norton 2003). None of the studies interpreted the coefficient on the interaction term correctly. A recent article by DeLeire (2000) is a welcome exception. The Stata command inteff computes the correct marginal effect of a change in two interacted variables for a logit or probit model
  5. Kevin Ralston, University of Edinburgh, 2017 The 'conventional' categorical by categorical interaction Introduction This post is the first of a series looking at interactions in non-linear models. This is a subject I have been thinking about for a while. It is an important issue for sociology, where we are often interested in substantively interesting categorie
  6. Paradoxically, even if the interaction term is not significant in the log odds model, the probability difference in differences may be significant for some values of the covariate. In the probability metric the values of all the variables in the model matter. References. Ai, C.R. and Norton E.C. 2003. Interaction terms in logit and probit models Computing interactions with anova Computing interactions with anova 3.7.4 Using Anov The significant interaction term indicates that there is a moderating effect to explore graphically! As you may or may not know, the above analysis can be run using either the GLM menu dialog or the regression dialog in SPSS. A key difference between the two is that you'll need to manually create the interaction term using the regression method. A belated followup to Maarten's lengthy post on this: I notice that, unlike -mfx-, the new -margins- command does not even report marginal effects for interaction terms, e.g. sysuse auto logit foreign price mpg c.mpg#c.price, nolog margins, dydx(*) This makes sense to me: the interaction term can't change unless one of its component terms changes For example, if you wanted to calculate adjusted pfp at different levels of debt1 the -margins- command knows that it needs to vary debt1 in the interaction term. When you create an interaction term manually (as you've correctly done), Stata doesn't know that that's what you've done so for any postestimation command you need to spell it out When a statistical equation incorporates a multiplicative term in an attempt to model interaction effects, the statistical significance of the lower-order coefficients is largely useless for the typical purposes of hypothesis testing

manually created interaction term versus ## command

Re: st: interaction variables - Stata

The margins command can only be used after you've run a regression, and acts on the results of the most recent regression command. For our first example, load the auto data set that comes with Stata and run the following regression: reg price c.weight##c.weight i.foreign i.rep78 mpg displacement. Levels of the Outcome Variable. If you just type Adding interaction terms to a regression model can greatly expand understanding of the relationships among the variables in the model and allows more hypotheses to be tested. The example from Interpreting Regression Coefficients was a model of the height of a shrub (Height) based on the amount of bacteria in the soil (Bacteria) and whether [ Daniel Klein, 2011. GENICV: Stata module to generate interaction between continuous (or dummy) variables, Statistical Software Components S457231, Boston College Department of Economics, revised 20 Mar 2011.Handle: RePEc:boc:bocode:s457231 Note: This module should be installed from within Stata by typing ssc install genicv. The module is made available under terms of the GPL v3 (https. 1.3 Interaction Plotting Packages. When running a regression in R, it is likely that you will be interested in interactions. The following packages and functions are good places to start, but the following chapter is going to teach you how to make custom interaction plots where the interaction term (×) could be formed explicitly by multiplying two (or more) variables, or implicitly using factorial notation in modern statistical packages such as Stata. The components x 1 and x 2 might be measurements or {0,1} dummy variables in any combination

I keep referring to this issue in manuscript reviews, so I thought it worth a post. If you include an interaction term in a model, the statistical significance of the main effects and the interaction term tells you nothing about the interactive effect. This seems contrary to your intuition. Turns out the interactive effect ma If you do want the interaction term on the odds ratio scale, then just exponentiate the interaction coefficient to get a ratio. In this example, we get a ratio of 0.97 The purpose of this paper is to explain the use of interaction terms in non-linear models. A paper by Ai and Norton (2003) has received a great deal of attention due to the importance of interaction terms in applied research. However, a number of issues regarding interaction terms con-tinue to be confusing to applied researchers

Regression with Stata Chapter 6: More on interactions of

  1. Interaction terms in logit and probit model
  2. Testing and Interpreting Interactions in Regression - In a Nutshell The principles given here always apply when interpreting the coefficients in a multiple regression analysis containing interactions. However, given these principles, the meaning of the coefficients for categorical variables varies according to th
  3. istration University of North Carolina at Chapel Hill interaction terms, logit, probit, nonlinear models. Download citation.
  4. Econometric Tools 2: Marginal E ects in Stata 1 Introduction Marginal e ects tell us how will the outcome variable change when an explanatory variable changes. In many cases the marginal e ects are constant, but in some cases they are not. In this lecture we will see a few ways of estimating marginal e ects in Stata. 2 Marginal E ects in OL

Deciphering Interactions in Logistic Regressio

Interaction effects occur when the effect of one variable depends on the value of another variable. Interaction effects are common in regression analysis, ANOVA, and designed experiments.In this blog post, I explain interaction effects, how to interpret them in statistical designs, and the problems you will face if you don't include them in your model How the interaction term is reported in the model is different, however. logit class3 i.sex#i.ft i.qual c.age Table2 , Stata output, logistic regression modelling membership of social class III, including independent variables sex, has a qualification, working full-time or part-time and age, also an alternatively reported interaction between. STATA: How can i estimate the marginal effect of an interaction term in panel data ? Hello there, i am using a model of the form: Y=a+β1 X1+β2X1*X2+X1t-10+X1t-10*X2+.. Multiple imputation with interactions and non-linear terms August 16, 2017 May 10, 2014 by Jonathan Bartlett One is that once the imputed datasets have been generated, they can each be analysed using standard analysis methods, and the results pooled using Rubin's rules

Interaction syntax in Stata - Stack Overflo

1. You should generally create the interaction term dynamically using the # notation. See -help varlist-. It is possible that you didn't create your interaction variable properly, or that Stata is dropping one or more terms due to collinearity because it doesn't realise that you want to model the interaction 2 coefplot looks for variables corresponding to the collected coefficient names and then uses their variable labels for the categorical axis. For factor variables, coefplot additionally takes value labels into account (the rule is to print the value label, if a value label is defined, and otherwise print the variable label or name along with. In this interaction plot, the lines are not parallel. This interaction effect indicates that the relationship between metal type and strength depends on the value of sinter time. For example, if you use MetalType 2, SinterTime150 is associated with the highest mean strength. However, if you use MetalType 1, SinterTime 100 is associated with the. •The meaning of the term interaction can be cause for confusion •In statistical terms, an interaction is present when the effect of one variable on the outcome depends on the levels of another variable. •Problem: Whether a statistical interaction is found or not depends on how effects are measured, i.e Plotting Interaction Effects of Regression Models Daniel Lüdecke 2020-03-09. This document describes how to plot marginal effects of interaction terms from various regression models, using the plot_model() function.plot_model() is a generic plot-function, which accepts many model-objects, like lm, glm, lme, lmerMod etc. plot_model() allows to create various plot tyes, which can be defined via.

The interaction term is statistically significant (p = 0.000), and R 2 is much bigger with the interaction term than without it (0.99 versus 0.80). Therefore, we conclude for this problem that the interaction term contributes in a meaningful way to the predictive ability of the regression equation Interaction terms in a regression An interaction term is where we construct a new explanatory variable from 2 or more underlying variables For instance we could multiply two variables together, say Price and Income The regression equation we would estimate would then be Q D = β 0 + β 1 P + β 2 Y + β 3 PY We do this if we think that the e. Here you can find Stata code for producing a marginal effect plot for one of the interacting variables, in this case X, based on three different types of multiplicative interaction models. It should be easy to adapt this code to deal with other types of interaction models. models employing interaction terms before using their results as the.

Interaction effects and group comparisons Page 1 Interaction effects and group comparisons . variables and interaction terms. would mean including black and the IV that was used in computing the interaction term. Here is the Stata output for our current example, where we test to see if the effect of Job Experience is. The three-way interaction term should be significant in the regression equation in order for the interaction to be interpretable. If you wish to use the Dawson & Richter (2006) test for differences between slopes, you should request the coefficient covariance matrix as part of the regression output Likewise, we can look at the table above to form the comparisons needed to obtain the simple effects of mealcat when yr_rnd is 1.

test _Ico1Wme3 _Ico2Wme3 ( 1) _Ico1Wme3 = 0.0 ( 2) _Ico2Wme3 = 0.0 F( 2, 391) = 3.20 Prob > F = 0.0417 In summary, all three of the simple effects of collcat at each level of mealcat were significant. However, the effect of collcat when mealcat was 3 might not be significant if we used a post hoc criteria for evaluating its significance. The postgr command can be used to simplify the process of computing adjusted means (i.e. predicted values when holding other variables constant).  Let’s assume that you have run the same regression as shown above

In our longitudinal model, we also look at an interaction term (continuous*continuous) as a predictor. We plotted the interaction in Mplus by using -2 SD, the mean, and +2 SD of one of the predictors in the interaction term, which obviously produces a plot with 3 lines Interaction are the funny interesting part of ecology, the most fun during data analysis is when you try to understand and to derive explanations from the estimated coefficients of your model. However you do need to know what is behind these estimate, there is a mathematical foundation between them that you need to be aware [

Interpreting Interactions in Regression - The Analysis Facto

Examples: Interaction Terms

  1. 2. Why the interaction terms are really log odds ratios I have also claimed that interaction coefficients in the loglinear models correspond to log odds ratios. We have demonstrated this in the first homework, and it can be easily demonstrated algebraicly. Let's start with a saturated model for the 2x2 table: Log(U)= Const+ B1R +B2C +B3R
  2. ing the magnitude and statistical significance of estimates of Δ 12
  3. 158 Computing interaction effects and standard errors The interpretation is also complicated if, in addition to being interacted, a variable has higher order terms—for example, if age squared is included in addition to age and age interacted with marital status. For all these more complicated models, the principle is the same: take derivative
  4. For the Chow Test, create an interaction term of the regressor salary and the dummy variable d, and then fit the model with the interaction and the dummy as follows: . gen salary_d = salary * d . regress motivation salary salary_d d size culture. The coefficient of d is the deviation of the second company's intercept from the baseline.

Video: Interpretation of interaction effects Paul W Dickma

Adding Interaction Terms to Multiple Linear Regression

d. difficulties interpreting main effects when the model has interaction terms e. use of STATA command to get the odds of the combinations of old_old and endocrinologist visits ([1,1], [1,0], [0,1], [0,0]) f. use of these cells to get the odds ratio given in the output and not given in the output g. use of lincom in STATA to estimate specific. difficulties interpreting main effects when the model has interaction terms e. use of STATA command to get the odds of the combinations of old_old and endocrinologist visits ([1,1], [1,0], [0,1], [0,0]) f. use of these cells to get the odds ratio given in the output and not given in the outpu

Testing and Dropping Interaction Terms in Regression and

Modeling and Interpreting Interactions in Multiple Regression Donald F. Burrill The Ontario Institute for Studies in Education Toronto, Ontario Canada A method of constructing interactions in multiple regression models is described which produces interaction variables that are uncorrelated with their component variables an Regression analysis with interaction term - Stata output. First, we see that the coefficient of the statistical interaction term is statistically significant at the 0.05 level. This means that that the interaction effect should not be ignored. How should it be interpreted? The coefficient of the interaction term is the difference in the effect.

Graphs in regression discontinuity design in "Stata" or "RGrad Fellow Notes: Interaction Terms in STATA – Causal Design

4. Add the interaction effect to the previous model (block 2) and check for a significant R2 change as well as a significant effect by the new interaction term. If both are significant, then moderation is occurring. If the predictor and moderator are not significant with the interaction term added, then complete moderation has occurred In Stata use the command regress, type: regress [dependent variable] [independent variable(s)] regress y x. In a multivariate setting we type: regress y x1 x2 x3 Before running a regression it is recommended to have a clear idea of what you are trying to estimate (i.e. which are your outcome and predictor variables) Prefixing trust and conformity with c. instructs Stata to treat them as continuous variables. Inserting ## between the variables tells Stata to include both variables and an interaction between them when estimating the model. Press Enter to run the analysis. Next, run the models using the centered independent variables of the main terms, X 1X 2, as the \interaction term. This brings us to our rst simple observations: 1. In a regression with interaction terms, the main terms should always be included. Otherwise, the interaction e ect may be signi cant due to left-out variable bias. (X 1 X 2 is by construction likely to be correlated with the main terms.)1 2 U9611 Spring 2005 11 A t-test for H 0: β 0=0 in the regression of Y on a single indicator variable I B, µ(Y|I B) = β 0+ β 2I B is the 2-sample (difference of means) t-test Regression when all explanatory variables are categorical is analysis of variance

Video: How to interpret interaction terms - Stephen Porte

STATA: How can i estimate the marginal effect of an

  1. The empirical study shows that the corrected interaction effect in an ordered logit or probit model is substantially different from the incorrect interaction effect produced by the margins command in Stata. Based on the correct formulas, this report verifies that the interaction effect is not the same as the marginal effect of the interaction term
  2. Interactions in Logistic Regression I For linear regression, with predictors X 1 and X 2 we saw that an interaction model is a model where the interpretation of the effect of X 1 depends on the value of X 2 and vice versa. I Exactly the same is true for logistic regression. I The simplest interaction models includes a predictor variable formed by multiplying two ordinary predictors
  3. Interaction effects represent the combined effects of factors on the dependent measure. When an interaction effect is present, the impact of one factor depends on the level of the other factor. Part of the power of ANOVA is the ability to estimate and test interaction effects. As Pedhazur an
  4. One traditional way to analyze this would be to perform a 3 by 3 factorial analysis of variance using the anova command, as shown below. The results show a main effect of collcat (F=4.5, p-0.0117), a main effect of mealcat (F=509.04, p=0.0000) and an interaction of collcat by mealcat, (F=6.63, p=0.0000). anova api00 collcat mealcat collcat*mealcat

r - Interaction Terms (Categorical * Continuous) - Cross

Understanding Interaction Effects in Statistics

  1. We can reparameterise the model so that Stata gives us the estimated effects of sex for each level of subite. We get the same estimates (and confidence intervals) as with lincom but without the extra step. The trick is to specify the interaction term (with a single hash) and the main effect of the modifier (subsite). Note that we are fitting.
  2. interpret lower-order interaction-term coefficients as if they were ordinary coefficients in a strictly additive model. Such an interpretation is erroneous. If β 1 is statistically significant, it is only reasonable to conclude that H 1: β 1 6= 0 cannot be rejected when X 2 = 0. The hypothesis may or may not be supported at other levels of X 2
  3. So the interaction effect tells by how much the effect of collgraddiffers between black and white women, but does so in multiplicative terms. The results also show that this interaction is not significant. 2. The trick I have used to display the baseline odds is discussed in the Stata tip by Newson (2003)
  4. interplot: Plot the Effects of Variables in Interaction Terms Frederick Solt and Yue Hu 2019-11-17. Interaction is a powerful tool to test conditional effects of one variable on the contribution of another variable to the dependent variable and has been extensively applied in the empirical research of social science since the 1970s (Wright Jr 1976)..
  5. attractive alternative to interpreting interactions effects in terms of marginal effects. The motivation for this tip is that there has been much discussion on how to in-terpret interaction effects when we want to interpret them in terms of marginal effects (Ai and Norton 2003; Norton et al. 2004; Cornelißen and Sonderhof 2009). (A sepa
  6. interaction(string) specifies the string to be used as delimiter for interaction terms (only relevant in Stata 11 or newer). The default is interaction( # ) . For tex and booktabs the default is interaction( $\times$ )
  7. Dropping the interaction term in this context amounts to saying that the job performance rating has the same impact on salary increases for both sexes. If, on the other hand, there is a difference in effects of Z, the interaction term will explain some of the variation in Y. 5. The important point is that W has a substantive meaning

Without an interaction term, the mean value for Females on Med B would have been α+β 1 +β 2. This implies a simple additive model, as we add the effect of beng female to the effect of being on med B. However, with the interaction term as detailed above, the mean value for Females on Med B is α + β 1 + β 2 + β 3, implying that over an Right, but to give a statement like You need 16 times the sample size to estimate an interaction than to estimate a main effect, you need to add in the assumption that the ratio of interaction effect over sigma approaches 0 (assuming you're looking at a Gaussian response variable)which is a pretty depressing assumption

Cox Regression: Can you get hazard ratios for an

  1. In an ANOVA, adding interaction terms still leaves the main effects as main effects. That is, as long as the data are balanced, the main effects and the interactions are independent. The main effect is still telling you if there is an overall effect of that variable after accounting for other variables in the model
  2. To explain the use of interaction terms in nonlinear models. We show how to calculate and interpret interaction effects using a publicly available Stata data set with a binary outcome. Stata 11 has added several features which make those calculations easier
  3. The interaction between housing and contact makes a much smaller dent, and the interaction between influence and contact adds practically nothing. (we could have compared each of these models to the additive model, thus testing the interaction directly. We would get chi2 of 22.51 on 6 d.f., 8.67 on 3 d.f. and 0.21 on 2 d.f.
  4. Interaction Terms Two Binary Variables Let's look at the probability that a household owns a radio based on whether anyone in the household has a regular job (a good proxy for income level) and whether the hosuehold is in a rural or urban area. To make Stata calculate and display the predicted values of own_radio in a nice table.

Linear Regression Assumptions • Assumption 1: Normal Distribution - The dependent variable is normally distributed - The errors of regression equation are normally distributed • Assumption 2: Homoscedasticity - The variance around the regression line is the same for all values of the predictor variable (X Let’s investigate this interaction further by looking at the simple effects of collcat at each level of mealcat. I did not need to create dummy variables, interaction terms, or polynomials. As we will see below, convenience is not the only reason to use factor-variable notation. Factor-variable notation allows Stata to identify interactions and to distinguish between discrete and continuous variables to obtain correct marginal effects In regression and ANOVA, an interaction occurs when the effect of one independent variable on the dependent variable is different at different levels of another independent variable. When one or both of the independent variables is categorical, then two common strategies for dealing with interactions are stratifying and adding an interaction term The two authors hold the necessary Stata code on their homepage. However, I would However, I would like to illustrate the issues raised by the interpretation of interaction terms when usin

Page 4 of C:\DATA\StatPrimer\stratified.wpd 12/21/00 Now consider Scenario C. Notice that RR 1 = 1.0 and RR 2 = 23.5. Since the nature of the association depends on the influence of extraneous factor C, an interaction between E and C can be said to exist manually created interaction term versus ## command 08 Aug 2014, 04:17 I would like to include an interaction term with two continuous variables in an OLS model, I originally computed the interactiont term by hand, i.e. gen new_ variable = variable_A * variable_B and included both variables and the interaction term in the model

Peter Flom's statistics 101: Interactions with categorical

308 Stata tip 87: Interpretation of interactions in nonlinear models black women without a college degree, we expect to find only 0.14 women with a high job for every woman with a low job. So even though the increase in odds as a result o Daniele, If you have Stata 11, you can just add a term to your regression like this using factor variables: reg y x1 x2 i.country##i.time This will include both country and time dummies as well as their interaction in your specification. If you just want the interaction, use only one #. DVM On Fri, Apr 15, 2011 at 12:20 PM, daniele.curzi. These are called partial interactions because contrast coefficients are applied to one of the terms involved in the interaction. Re: interaction term in regression Posted 06-26-2012 (43338 views) | In reply to mei If you are committed to proc reg, rather than the many other linear modeling procs, you will have to create the interaction variable in a data step

00 > 0, the interaction is sometimes said to be positive or super-additive. If p 11 p 10 p 01 þp 00 <0, the interaction is said to be negative or sub-additive. Table 1 Risk of lung cancer by smoking and asbestos status No asbestos Asbestos Non-smoker 0.0011 0.0067 Smoker 0.0095 0.0450 T. J. VanderWeele and M. J. Knol: A Tutorial on. (using Stata) (work in progress) Oscar Torres generate the interaction) reg y time##treated, r * The coefficient for 'time#treated' is the differences-in-differences estimator ('did' in the previous example). The effect is significant at 10% with the treatment having a negative effect Introduction to Structural Equation Modeling Using Stata Chuck Huber StataCorp California Association for Instituional Research November 19, 201 Analysis of covariance (ANCOVA) is a general linear model which blends ANOVA and regression.ANCOVA evaluates whether the means of a dependent variable (DV) are equal across levels of a categorical independent variable (IV) often called a treatment, while statistically controlling for the effects of other continuous variables that are not of primary interest, known as covariates (CV) or. The interaction term is then difference between what you expected from the two individual differences and the result. In this case its a negative number, -43.66. Another way to see this is to imagine we are decomposing the difference between f(x1,x2) and f(x2,y2)

You may wonder why we have gone to the effort of using xi3 for creating and testing these effects instead of just using dummy coding like we would get with the xi command. Let’s compare how to get simple effects using the xi3 command via effect coding to how we would get simple effects using xi with dummy coding. We hope to show that it is much easier to use effect coding via xi3 and that the interpretation of the coefficients is much more intuitive. Finding Interactions. The concept of an interaction can be a difficult one for students new to the field of psychology research, yet interactions are an often-occurring and important aspect of behavioral science. The following lesson will introduce the concept of a statistical interaction, provide examples of interactions, and show you how to. In the second model the interaction term between age and market penetration is negative but not statistically significant. Again, the interaction effect varies widely, and is positive for many observations (see Fig. 2A).Even though the interaction term is itself not statistically significant, the interaction effect is significant for most observations (see Fig. 2B) The purpose of this paper is to explain the use of interaction terms in nonlinear models. term agefem improve the goodness of fit of the model can be answered simply with a z-test on the coefficient of the interaction term in a logit model. The Stata 11 syntax uses c. to indicate a continuous variable, i. to indicate a dummy variable.

Factor Variables and Marginal Effects in Stata 11 Christopher F Baum Boston College and DIW Berlin January 2010 Using factor variables Interaction effects Interaction effects taking account of the squared term as well, as Stata understands the mathematics of the specification in this explicit form XZ is the interaction term calculated as X multiplied by Z, b 0 is the intercept, b 1 is the effect of X on Y, b 2 is the effect of Z on Y, and b 3 is the effect of XZ on Y. To understand how the interaction term XZ tests for a moderated relationship, consider Equation 1 11 LOGISTIC REGRESSION - INTERPRETING PARAMETERS outcome does not vary; remember: 0 = negative outcome, all other nonmissing values = positive outcome This data set uses 0 and 1 codes for the live variable; 0 and -100 would work, but not 1 and 2. Let's look at both regression estimates and direct estimates of unadjusted odds ratios from Stata

what is the command for interaction term? Statistics

The focus on multiplicative interaction is likely due to the statistical models which are used in such analyses (e.g. logistic regression) and the fact that the models employed immediately give interactions (and confidence intervals) on a multiplicative scale In general, if interaction are interest it is probably good to repor Interactions can get yet more complicated. Two continuous variables can interact. Three variables can interact. You can have multiple two-way interactions. And so on. Even though software makes it easy to fit lots of interactions, Kutner, et al. (2005) suggest keeping two things in mind when fitting models with interactions First, to safeguard against multiple testing, we test if the whole set of interaction terms is significant or not using extra sum of squares F test: m01 <- lm(y ~ x + group) m02 <- lm(y ~ x + group + x:group) anova(m01, m02) If this test is significant, then at least one of the interaction terms in the model is significant

REGRESSION LINES IN STATA THOMAS ELLIOTT 1. Introduction to Regression variable to vary for the categories of the other variables by including an interaction term (see interaction handout). Including an interacting term between sex and home o ce will reproduce the cell averages accurately Figure 2: Estimated power for the interaction term in a logistic regression model The table and graph above indicate that 80% power is achieved with four combinations of sample size and effect size. Given our assumptions, we estimate that we will have at least 80% power to detect an odds ratio of 1.04 for sample sizes of 600, 800, and 1000

Dummy Variable: Dummy Variable And Interaction TermThe Stata Blog » Calculating power using Monte CarloVisualizing continuous-by-continuous interactions withReed College | Stata Help | Repeated and Mixed-Measure
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