A primer on regression artifacts

"Regression toward the mean is a complex statistical principle that plays a crucial role in any research involving the measurement of change. This primer is designed to help researchers and students more fully understand this phenomenon and avoid common errors in interpretation. The book presents new methods of graphing regression toward the mean, giving special attention to applications related to program or treatment evaluation. Numerous concrete examples illustrate the ways researchers all too often attribute effects to an intervention or other causal variable without considering regression artifacts as an alternative explanation."--BOOK JACKET.