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February 1999, Vol 56, No. 2 >

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Letters to the Editor | February 1999

Violence in the Mentally Ill: Questions Remain

Pal Czobor, PhD; Jan Volavka, MD, PhD
Arch Gen Psychiatry. 1999;56(2):193. doi:10.1001/archpsyc.56.2.193.
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The landmark study of Steadman et al,1 though carefully designed, has certain limitations. The investigators adopted the log-linear analysis as the principal method to analyze event rates for violent and aggressive behavior. This method ignores the fact that repeated observations are made in the same subjects, and assumes that measurements from the same subject are independent.

However, within-subject measurements over time are related. Omission of temporal relationships in repeated measures data can cause the probability of type I error to deviate from the nominal level of statistical significance (P<.05) and lead to false statistical inference.

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