Issue: December 2011

The Methodology Center
Penn State Lion Shrine


PROC LCA Available for 64-bit SAS and 32-bit SAS

PROC LCA is free to download  at
In recent months, we received requests for a version of PROC LCA & PROC LTA for 64-bit SAS. The 64-bit compatible version of PROC LCA is now available on our website. For people with questions about installing PROC LCA there is also a new three-minute video with installation instructions and tips. For those who already have version 1.2.7 of the procedure installed, there is no need to re-download.

Thanks to all of those who gave us feedback; please continue to email with your comments or questions.

Download the procedure.
Watch the video.


Podcast: Social Networks in Prevention Research

Rachel Smith, Ph.D.
    Rachel Smith, Ph.D.
In our latest Methodology Minutes podcast, host Aaron Wagner interviews Rachel Smith, Associate Professor of Communication Arts and Sciences at Penn State University, Research Investigator at The Methodology Center, and affiliate of the Center for Infectious Disease Dynamics. The discussion focuses on the nature of social influence, the role of social networks in the spread and prevention of HIV, and the value of interdisciplinary collaboration.

Download the podcast.


Featured Article: Preventing High-Risk Collegiate Drinking

Featured Article
In a new article in the journal Psychology of Addictive Behaviors, Michael Cleveland and his co-authors use latent transition analysis (LTA) to examine alcohol use among 1,275 high-risk, first-year college students. Alcohol use was measured during the summer before entering college and the students' first semester of college. Seven indicators of alcohol use were used in the LTA models. The analysis identified four patterns of drinking at both times: nondrinkers, weekend non-bingers, weekend bingers, and heavy drinkers. Researchers also examined the effects of parent- and peer-based interventions designed to prevent increased drinking. The results indicate there is value in considering multiple dimensions of alcohol use within a person-centered approach. That is, differential treatment effects were found across baseline drinking levels, suggesting the benefit for tailored intervention programs to reduce high-risk drinking among college students.

Read more.



Welcome to our new subscribers!

Welcome to all those who are new to the eNews this month. We hope you find it useful and enjoyable. If you have any feedback, please email


3-minute video on installing PROC LCA Installing PROC LCA & PROC LTA


Did you miss our open house?

Then visit our virtual poster session which will introduce you to many of our research topics.


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