Misspecifications of the Normal Distribution

Incorrect statements about the normal distribution are discussed and illustrated with counterexamples.     

Changing Directions in HIV Prevention: The Move Toward a Psychosocial Model

ABSTRACT

Although some HIV prevention programs have been successful in helping gay and bisexual men change their sexual behaviors, rates of HIV infection continue to increase. In an attempt to address this problem, social workers need to move beyond traditional HIV prevention approaches to a psychosocial model of HIV prevention. Based on the work of previous researchers, this approach assumes that a combination of individual, psychological, and social factors contribute to risky sex in gay and bisexual men. Because social workers are trained to view problems from a psychosocial framework, they are already in a position to develop programs incorporating the psychosocial model. This article examines the psychosocial model of HIV prevention and the various psychosocial factors that may contribute to high-risk sexual behavior and concludes with examples of prevention research that have already incorporated the model.     

The mean of linear signed rank statistics under alternatives

An expression is presented for the mean of a linear signed rank statistic for the one sample location model. Several examples are given to illustrate its application.