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A sample of psychiatry patients were cross-classified by their diagnosis and whether a drug treatment was prescribed.
A data frame with 10 observations on the following 3 variables.
the number of patients
a factor with levels Affective.Disorder
Neurosis
Personality.Disorder
Schizophrenia
Special.Symptoms
a factor with levels no
yes
Agresti A. (1990) "Categorical Data Analysis" Wiley