Reply to comments on Lipsey and Wilson (1993).

Replies to comments by H. J. Eysenck, D. Sohn, and H. Cooper et al (see PA, Vol 82:22192, 22208, and 22189, respectively) regarding Lipsey and Wilson's (see record 1994-18340-001) meta-analysis of meta-analyses. Both Sohn and Eysenck seem to be concerned with how theory is developed, but they may be confused about the role of meta-analysis in that process. It is argued that the purpose of meta-analysis is to develop generalizations about research findings across different studies. The extension of the analysis by Cooper et al reminds researchers that meta-analysis can be subject to error and bias. (PsycINFO Database Record (c) 2010 APA, all rights reserved)