ON THE FORM OF THE RETENTION FUNCTION - COMMENT ON RUBIN AND WENZEL (1996) - A QUANTITATIVE DESCRIPTION OF RETENTION

D. C. Rubin and A. E. Wenzel (1996) fitted many simple functions to a large collection of retention data sets. Their search for the mathemat ical form of the retention function can be simplified by (a) attending to the failures of simple functions, (b) considering the constraints and process assumptions that any psychological theory must obey, and ( c) drawing on results from survival theory. Three sets of psychologica lly plausible assumptions to interpret the form of a retention functio n are described. These representations converge on a single functional form, demonstrating the impossibility of determining process purely f rom empirical fits. A candidate form for an empirical retention functi on whose parameters separate the various aspects of retention is propo sed. These parameters can be used to compare results from different st udies.