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Time sampling: a methodological critique.
J Mann1, T Ten Have, J W Plunkett
1Center for Human Growth and Development, University of Michigan, Ann Arbor 48109.
Child Development
|April 1, 1991
Summary
Time sampling, a common method in developmental studies, inaccurately estimates behavior duration and frequency. Researchers suggest using more valid methods like continuous sampling for accurate social behavior analysis.
Area of Science:
- Developmental Psychology
- Ethology
- Behavioral Observation
Background:
- Time sampling is widely used in developmental studies to observe social behavior.
- This method aims to estimate behavior frequency, duration, and group differences.
Purpose of the Study:
- To evaluate the accuracy of time sampling compared to continuous sampling.
- To identify conditions under which time sampling errors are most significant.
Main Methods:
- Comparative analysis of time sampling and continuous sampling techniques.
- Examination of error rates based on behavior bout length and interval duration.
Main Results:
- Time sampling significantly underestimates or overestimates actual behavior durations and frequencies.
- Individual and group differences in behavior can be misrepresented by time sampling.
- Error rates escalate with shorter behavior bout lengths and longer sampling intervals.
Conclusions:
- Time sampling is unreliable for accurately measuring social behaviors, especially short-duration interactions like those in mother-infant studies.
- Alternative methods such as scan, point, or continuous sampling are recommended for greater validity in behavioral research.