A meta-analytic review of the distribution of practice effect: Now you see it, now you don't.

@inproceedings{Donovan1999AMR,
  title={A meta-analytic review of the distribution of practice effect: Now you see it, now you don't.},
  author={John J. Donovan and David J. Radosevich},
  year={1999}
}
The present review examined the relationship between conditions of massed practice and spaced practice with respect to task performance. A meta-analysis of 63 studies with 112 effect sizes yielded an overall mean weighted effect size of 0.46, indicating that individuals in spaced practice conditions performed significantly higher than those in massed practice conditions. Subsequent analyses, however, suggested that the nature of the task- being practiced, the intertrial time interval, and the… 

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