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Taking a closer look: time sampling and measurement error.

J Powell1, B Martindale, S Kulp

  • 1California State College, California, Pennsylvania.

Journal of Applied Behavior Analysis
|July 1, 1977
PubMed
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Momentary time sampling is more accurate than interval time sampling for measuring behavior duration. Interval time sampling introduces significant, inconsistent errors, especially when behavior frequency and duration are confounded.

Area of Science:

  • Behavioral analysis
  • Applied behavior analysis
  • Research methodology

Background:

  • Accurate measurement of behavior is crucial in applied behavior analysis.
  • Traditional interval time sampling methods may introduce measurement error.
  • Understanding the limitations of different direct observation methods is essential.

Purpose of the Study:

  • To compare the accuracy of whole interval, partial interval, and momentary time-sample measures against a continuous measure of in-seat behavior.
  • To analyze the sources and characteristics of measurement error in interval time sampling.
  • To determine the superiority of momentary time sampling in estimating behavior duration.

Main Methods:

  • A participant engaged in in-seat behavior across sessions with varying occurrence rates (20%, 50%, 80%).

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  • Continuous measurement (percentage of time) was used as the standard.
  • Whole interval, partial interval, and momentary time-sample data were collected and compared to the continuous measure.

    • Main Results:

    • Interval time sampling (whole and partial) exhibited extensive, unidirectional, and inconsistent measurement errors.
    • Errors in interval time sampling were found to be a function of the time per response.
    • A procedural analysis revealed that frequency and duration are confounded in interval time sampling.
    • Momentary time sampling demonstrated greater accuracy in estimating behavior duration compared to interval methods.

    Conclusions:

    • Interval time sampling methods are prone to significant measurement error, potentially compromising data integrity.
    • The confounding of behavior frequency and duration in interval time sampling limits its utility for duration measurement.
    • Momentary time sampling offers a more reliable and accurate method for estimating the duration of observed behaviors.