Question: Using R, Use the dplyr::do() function and the HELPrct data frame from the mosaicData package to fit a regression model predicting cesd as a function

Using R,

Use the dplyr::do() function and the HELPrct data frame from the mosaicData package to fit a regression model predicting "cesd" as a function of "age" separately for each of the levels of the "substance" variable. Generate a table of results (estimates and condence intervals) for each level of the grouping variable.

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