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Related Concept Videos

One-Way ANOVA: Equal Sample Sizes01:15

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Related Experiment Video

Updated: Dec 27, 2025

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Sources of behavioral variance: Implications for sample size decisions.

Sue Thiemann1, Helena C Kraemer1

  • 1Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, California.

American Journal of Primatology
|February 29, 2020
PubMed
Summary

To improve research design for chimpanzee behavior studies, stratify groups only when factors strongly correlate with behavior. Multiple observations per subject significantly enhance generalizability, even with small sample sizes.

Keywords:
research designsample sizestatistical power

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Area of Science:

  • Primatology
  • Behavioral Science
  • Research Methodology

Background:

  • Understanding variance in chimpanzee behavior is crucial for effective research.
  • Previous studies may have lacked optimal research designs, impacting sample size selection and generalizability.

Purpose of the Study:

  • To identify sources of variance in chimpanzee behaviors.
  • To provide criteria for selecting appropriate sample sizes in behavioral research.
  • To optimize research design for studying primate behavior.

Main Methods:

  • Intensive study of variance sources in diverse chimpanzee behaviors.
  • Analysis of factors influencing behavioral observation reliability and observer training.
  • Evaluation of the impact of multiple observations per subject and temporal distribution.

Main Results:

  • Stratification of groups is beneficial only when the stratification factor strongly correlates with behaviors of interest.
  • High reliability in behavioral observation systems and well-trained observers minimize gains from using multiple observers per observation.
  • Multiple observations per subject per time period significantly strengthen research design, enabling generalizable results even with small sample sizes.
  • Uniform distribution of observations over time is essential, especially for behaviors exhibiting temporal changes.

Conclusions:

  • Research design in primatology should prioritize multiple observations per subject to enhance generalizability.
  • Careful consideration of stratification factors and observer consistency is key to efficient research.
  • Optimal sample size selection and observation scheduling are critical for robust findings in behavioral studies.