445 college students were classified according to both frequency of marijuana use and parental use of alcohol and psychoactive drugs.
A data frame with 9 observations on the following 3 variables.
Number of parents using drugs or alcohol - a factor with levels
Student usage of marijuana - a factor with levels
the number of cases
Ellis, Godfrey J. and Stone, Lorene H. (1979) Marijuana Use in College: "An Evaluation of a Modeling Explanation" Youth and Society 10, 323-34
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