This second edition of Research Design and Statistical Analysis is a major revision of the earlier work. Although it covers many of the same research designs and data analyses as the earlier book, there have been changes in content and organization. Some new chapters have been added; some concepts not mentioned in the first edition have been introduced, and the coverage of some concepts that were previously discussed has been expanded. We have been motivated in part by our sense that data analysis too often consists of merely tabling means or correlation coefficients, and doing time-honored analyses on them without really looking at the data. Our sense that we can learn more from our data than we often do has been reinforced by the recent publication of the American Psychological Association's guidelines for statistical methods (Wilkinson, 1999). Among other things, these guidelines urge researchers to plot and examine their data, to find confidence intervals, to use power analyses to determine sample size, and to calculate effect sizes. We illustrate these, and other, procedures throughout this book. It may be helpful to consider the changes from the first to the second edition in greater detail.
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