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Related Experiment Videos

Comparison of one-sample two-sided sequential t-tests for application in epidemiological studies

I van der Tweel1, R Kaaks, P A van Noord

  • 1Centre for Biostatistics, Utrecht University, The Netherlands.

Statistics in Medicine
|December 30, 1996
PubMed
Summary

Whitehead

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Area of Science:

  • Epidemiology
  • Biostatistics

Background:

  • Prospective cohort studies utilize laboratory analysis of biological specimens to measure exposure levels in cases and controls.
  • Sequential tests offer preliminary evaluations to determine if an etiological hypothesis warrants further investigation, conserving resources.

Purpose of the Study:

  • To compare Rushton's approximation sequential probability ratio test (SPRT) with Whitehead's profile log-likelihood method for matched epidemiological data.
  • To evaluate the performance of these sequential testing methods regarding statistical power and significance levels.

Main Methods:

  • Mathematical comparison and computerized simulations were employed.
  • The study compared Rushton's SPRT for matched data against Whitehead's profile log-likelihood method.
  • Analysis focused on average sample size, statistical power, and significance levels across varying control-to-case matching ratios.

Main Results:

  • Whitehead's method closely adhered to pre-specified statistical power and significance levels, irrespective of the number of controls per case.
  • Rushton's SPRT was found to be conservative and could lead to a significant loss in statistical power.
  • Increasing controls per case reduced average sample size for both methods.

Conclusions:

  • Whitehead's profile log-likelihood method is preferred over Rushton's SPRT for sequential analysis in epidemiological studies due to its reliability in maintaining statistical integrity.
  • Whitehead's method offers advantages including applicability to groupwise data inspection and easy conversion to a truncated procedure.
  • The availability of Whitehead's method in the PEST computer program further supports its practical utility.

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