How does the interpretation of regression coefficients differ for dummy coding of dummy variables versus effect coding of dummy variables (hint: in one type of coding, b0 corresponds to the grand mean; in the other, b0 corresponds to the mean of one of the groups).
Answer to relevant QuestionsIf you have k groups, why do you only need k-1 dummy variables to represent group membership? Why is it impossible to include k dummy variable as predictors in a regression when you have k groups? Do the following analysis using the hypothetical data in Table 13.7. In this imaginary experiment, participants were randomly assigned to receive either no caffeine (1) or 150 mg of caffeine (2); and to a no exercise ...What information should be included in the report of a standard or simultaneous multiple regressions (all predictors entered in one step)? What are the different methods of entry for predictors in multiple regressions? Briefly comment on the difference between the use of a bootstrapped CI (for the unstandardized estimate of a * b) versus the use of the Sobel test. What programs can be used to obtain the estimates for each case? Which ...
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