Table 3.12 classifies a sample of psychiatric patients by their diagnosis and by whether their treatment prescribed drugs.

Partition chi-squared into three components to describe differences and similarities among the diagnoses, by comparing (I) the first two rows, (ii) the third and fourth rows, and (iii) the last row to the first and second rows combined and the third and fourth rows combined.

Table 3.12:

Diagnosis Schizophrenia Affective disorder Neurosis Personality disorder Special symptoms No Drugs Drugs 105 12 2 19 18 47 52 13