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Coefficients alpha for the tactual performance test trials.

R A Charter1

  • 1Department of Veterans Affairs, VA Long Beach Healthcare System, California 90822, USA.

Perceptual and Motor Skills
|July 17, 2001
PubMed
Summary
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The Spearman-Brown formula

Area of Science:

  • Neuropsychology
  • Psychometrics

Background:

  • The Spearman-Brown formula is often used to estimate reliability.
  • This formula requires strict assumptions that may not always be met.

Purpose of the Study:

  • To reanalyze Tactual Performance Test (TPT) data from 2000.
  • To apply coefficient alpha as a more robust reliability estimation method.

Main Methods:

  • Reanalysis of Tactual Performance Test (TPT) trials data.
  • Application of coefficient alpha for reliability estimation.

Main Results:

  • Coefficient alpha provided reliability values for the TPT trials.
  • These values are considered a better estimate of population reliability compared to Spearman-Brown.

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Conclusions:

  • Coefficient alpha is a more appropriate method for estimating the reliability of TPT trials.
  • Reanalysis confirms the utility of coefficient alpha in psychometric evaluations.