On estimating processing variance: Commentary and reanalysis of Kail's “developmental functions for speeds of cognitive processes”
1992
Abstract A recent paper by Kail (1988) in this journal appears to contain a significant error in the data analysis. The “goodness-of-fit” coefficients reported which suggest that overall about 94% of the variance can be accounted for by the model seem to be a substantial overestimation as a result of inappropriate procedures for statistical modeling. Using the data made available to us by Kail, we have reanalyzed these results. The corrected values range from 0.9 to 92.1% for the individual tasks with an overall average between 40 and 60%. We suggest that the support for the original conclusions is considerably weaker than reported.
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