The utility of a quantitative model depends on the extent to which its fitted parameters vary systematically with environmental events of interest. Professional football statistics were analyzed to determine whether play selection (passing versus rushing plays) could be accounted for with the generalized matching equation, and in particular…

Models of a psychological process can be difficult to discriminate experimentally because it is not easy to determine the values of the critical design variables (e.g., presentation schedule, stimulus structure) that will be most informative in differentiating them. Recent developments in sampling-based search methods in statistics make it…

Discusses analysis of covariance (ANCOVA), a standard tool for data analysis in psychological research. Considers the two major ways in which psychologists have used the technique: for increasing the precision of estimation in randomized experiments and for seeking to remove bias in nonrandomized studies, comparing ANCOVA with analytic…