- Social contact, social attitudes, and twin similarityS F Posner
Medical Effectiveness Research Center, University of California, San Francisco 94143 0856, USA
Behav Genet 26:123-33. 1996..However, an increased estimate of the contribution of shared environmental variance in the high-contact males could additionally suggest that contact leads to similarity...
- The acquisition and maintenance of safer sexual behaviors among injection drug usersS F Posner
Medical Effectiveness Research Center for Diverse Populations, University of California, San Francisco 94118, USA
Subst Use Misuse 31:1995-2015. 1996..This finding highlights the need for continual, sustained interventions to help maintain safer sex and drug-using behaviors in high-risk groups...
- Evaluation and extensions of a structural equation modeling approach to the analysis of survival dataS F Posner
Department Obstetrics, Gynecology and Reproductive Sciences, University of California, San Francisco, USA
Behav Genet 30:41-50. 2000..Power results were not affected by distribution type; sample sizes of 500 were above the .80 level. Parameter estimates continued to be upwardly biased in this more general model, although the degree of bias was smaller...