主要内容包括：
1 Introduction and Overview 2
2 Formulating a Research Problem 5
3 Searching the Literature 7
4 Coding Studies 10
5 Calculating Mean Di®erence E®ect Sizes 15
6 Calculating Correlation E®ect Sizes 25
7 Issues in Calculating E®ect Sizes 29
8 Describing E®ect Size Distributions 32
9 Examining Moderating Variables 37
10 Writing Meta-Analytic Reports 42
11 Critically Evaluating a Meta-Analysis 46

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