E
RRATUM
In the Methods section of an article by Thase et al (Biol Psychiatry 1997;41:964 –973) it was incorrectly stated that a discriminant index score that was derived from a healthy control group was subtracted from a score derived from depressed inpatients. Rather, scores from patients were
subtracted from the control subjects. The formula used to classify sleep abnormality, [220.5 1 (0.519 3 RL) 2
(1.613 RD)1 (0.22 3SE)], is reported correctly. The error in describing the method does not affect the results of the article.