Given the severe assumptions needed for use of the Spearman-Brown reliability formula, the Tactual Performance Test trials data described in 2000 were reanalyzed using coefficient alpha. These values are considered the best estimate of the population reliability for the trials.
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References
1.
CharterR. A. (2000) Internal consistency of the Tactual Performance Test trials. Perceptual and Motor Skills, 91, 460–462.
2.
CharterR. A. (in press) It is time to bury the Spearman-Brown “prophecy” formula for some common applications. Educational and Psychological Measurement.
