aids data frame has 4 rows and 4 columns.
On February 15, 1991, the New York Times published the results of a study on the presence of AIDS symptoms and AZT use. The data were cross-classified according to the race of the patients.
This data frame contains the following columns:
the number of patients with AIDS symptoms;
the number of patients without AIDS symptoms;
an indicator variable for AZT use;
an indicator variable for the race (
The data were obtained from the New York Times (2/15/91).
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