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Evaluating When Subscores Add Value in Psychological and Health Applications.

Molly J Gardner1, Michael C Edwards1,2

  • 1Arizona State University, Tempe, USA.

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Using subscores in psychological and health research offers practical benefits. Augmentation can improve subscore reliability when it is initially low, enhancing measurement accuracy.

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Area of Science:

  • Psychometrics
  • Health Psychology
  • Educational Measurement

Background:

  • Many psychological and health scales are designed for subscores, but total scores are often reported.
  • Subscores can suffer from inadequate reliability due to their shorter length.
  • Augmentation methods from educational measurement can enhance subscore reliability.

Purpose of the Study:

  • To assess the costs of using total scores instead of subscores.
  • To determine the effectiveness of score augmentation in improving subscore reliability.

Main Methods:

  • Simulated data were used to analyze the benefits of subscores versus total scores.
  • The study quantified the reliability improvements gained from augmented subscores compared to non-augmented ones.

Main Results:

  • Subscores provide practical advantages when scales are designed to yield them.
  • Augmentation significantly improves reliability in situations with low initial subscore reliability.

Conclusions:

  • Utilizing subscores is recommended when scales are designed for them.
  • Augmentation is a valuable strategy to overcome reliability challenges with subscores.