Summary and Guidelines for Implementing a Meta-Analysis Overview
This chapter begins with a summary and overview of the SAS PROC MEANS procedure to meta-analysis and then proceeds to present some general guidelines for implementing a meta-analysis.
The methodology for conducting both a Hunter and Schmidt (Hunter & Schmidt, 1990a; Hunter et al., 1982; Schmidt & Hunter, 1977) and a Glassian (Glass, 1976; Glass et al., 1981) meta-analysis using the PROC MEANS procedure in SAS to perform the computations offers several important advantages, including widespread availability both on PCs and mainframes, ease of use, availability of several meta-analysis outcome statistics, and a high degree of flexibility in regard to which corrections can be made for any number and combination of artifacts depending on the information provided in the primary studies. The programs can also be modified to meet the specific needs of the user (e.g., changing the z-values of the confidence and credibility intervals). Furthermore, one particularly attractive feature of this approach is the ease with which moderator variables can be analyzed-by simply adding a few additional statements to the SAS program.