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Related Experiment Videos

Rao's polynomial growth curve model for unequal-time intervals: a menu-driven GAUSS program.

E D Schneiderman1, S M Willis, T R Ten Have

  • 1Department of Oral and Maxillofacial Surgery, Baylor College of Dentistry, Dallas, TX 75246.

International Journal of Bio-Medical Computing
|December 1, 1991
PubMed
Summary

This study introduces an improved statistical program for analyzing longitudinal data, offering a user-friendly tool for growth and development research. The software utilizes Rao's polynomial growth curve model for accurate analysis of serial records.

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Area of Science:

  • Biometrics
  • Anthropometry
  • Developmental Biology

Background:

  • Longitudinal data analysis often relies on inappropriate cross-sectional methods due to software limitations.
  • Existing methods lack suitable statistical software for analyzing serial records in growth and development studies.
  • Previous work introduced Rao's polynomial growth curve model and an SAS program for complete longitudinal data.

Purpose of the Study:

  • To extend Rao's polynomial growth curve model to analyze longitudinal data with unequal time intervals.
  • To present a user-friendly, accessible, and efficient GAUSS program for longitudinal data analysis.
  • To provide a valuable tool for researchers studying growth, development, and treatment effects.

Main Methods:

  • Utilized Rao's polynomial growth curve model for analyzing longitudinal data.

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  • Developed a stand-alone GAUSS program for PC-compatibles, accommodating unequal time intervals.
  • Incorporated improvements in accessibility, operation, and user-friendliness, including color graphic displays.

    • Main Results:

    • The enhanced GAUSS program successfully analyzes longitudinal data with unequal time intervals.
    • The program computes average polynomial growth curves, 95% confidence bands, coefficients, and confidence intervals.
    • Demonstrated application using human upper incisor angulation as a developmental variable.

    Conclusions:

    • The developed GAUSS program is a valuable and accessible tool for analyzing longitudinal data.
    • The method is suitable for studying growth, development, and treatment effects across various species.
    • Immediate applications are foreseen in orthodontics, maxillofacial surgery, and pediatrics.