Contact: L.V. Madden
The Ohio State University/OARDC

Statistical Workshops

This website is dedicated to the support of workshops taught by Larry Madden and colleagues. Most of the workshops are taught at the annual meetings of the American Phytopathological Society (APS) and of other scientific societies. Please go to the pages for Instructional Material and Downloads  to obtain files for the upcoming and past workshops.

Next Workshop:

Meta-analysis for Combining Results
from Multiple Studies in Plant Pathology

L.V. Madden (Ohio State Univ.)
P.A. Paul (Ohio State Univ.)

At the 2017 Annual Meeting of
The American Phytopathological Society
San Antonio, Texas
Henry B. Gonzalez Convention Center
Saturday August 5th 10am - 5pm

Participation in this workshop requires
prior registration


  Meta-analysis is the analysis of results of multiple independent studies, which is performed in order to synthesize the evidence from many possible sources in a formal quantitative manner. In the most common case, the outcome of each study becomes a single observation in the meta-analysis of all available studies. The discipline developed originally in the social sciences in the 1970s, and has now been embraced within many scientific disciplines. This workshop will cover basic concepts and approaches in meta-analysis, and show how to estimate parameters and interpret results. Methods for expanding the meta-analytical model to account for study-level characteristics (so called moderator variables) and for multiple treatments per study will be reviewed. Methods will be explained primarily using SAS software, and also with R.


  • Registrants need to bring a laptop with SAS 9.3 (or later) installed. The free SAS University Edition is also acceptable.
  • There will be a one hour lunch break, but lunch is not provided.

Larry Madden

Distinguished Professor in Plant Protection and Associate Chair of the OSU Dept. of Plant Pathology.