Question: Perform the simple-effects tests for the sexrace effect on the inhale+inject and freebase+inject subsets of the cocaine usage data, as described in this chapter. Compare

Perform the simple-effects tests for the sex×race effect on the inhale+inject and freebase+inject subsets of the cocaine usage data, as described in this chapter. Compare the sex×race model with the sex+race model, and evaluate the sex+race model against the corresponding null model.

The data for R-users is available in the smdata package via the command data("cocaineplus", package="smdata"), and for Stata users at https://dl.dropbox.com/u/1857674/SmiMerBook/SmiMerDoc.html via the link for “ch3 cocaineplus.dta”.

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