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.
Czobor P, Volavka J. Violence in the Mentally Ill: Questions Remain. Arch Gen Psychiatry. 1999;56(2):193. doi:10.1001/archpsyc.56.2.193