Combining Speed and Accuracy in Cognitive Psychology: Is the Inverse Efficiency Score (ies) a Better Dependent Variable than the Mean Reaction Time (rt) and the Percentage of Errors (pe)?

@inproceedings{Bruyer2011CombiningSA,
  title={Combining Speed and Accuracy in Cognitive Psychology: Is the Inverse Efficiency Score (ies) a Better Dependent Variable than the Mean Reaction Time (rt) and the Percentage of Errors (pe)?},
  author={Raymond Bruyer},
  year={2011}
}
Experiments in cognitive psychology usually return two dependent variables: the percentage of errors and the reaction time of the correct responses. Townsend and Ashby (1978, 1983) proposed the inverse efficiency score (IES) as a way to combine both measures and, hence, to provide a better summary of the findings. In this article we examine the usefulness of IES by applying it to existing datasets. Although IES does give a better summary of the findings in some cases, mostly the variance of the… CONTINUE READING
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