Key points are not available for this paper at this time.
Click to increase image sizeClick to decrease image size ACKNOWLEDGMENTS This review was written while Stephen G. West was a visiting professor with the Arbeitsbereich Methoden und Evaluation, Freie Universität Berlin, Germany, supported by a Forschungspreis from the Alexander von Humboldt Foundation. We thank Leona Aiken, Associate Editor Kevin Grimm, Keith Markus, William Shadish, Patrick Shrout, and Felix Thoemmes for comments on an earlier version of this review.
West et al. (Thu,) studied this question.