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Related Experiment Videos

Correcting for single ascertainment by truncation for a quantitative trait.

M R Young1, M Boehnke, P P Moll

  • 1Department of Biostatistics, School of Public Health, University of Michigan, Ann Arbor 48109.

American Journal of Human Genetics
|November 1, 1988
PubMed
Summary

This study compares two methods for correcting single ascertainment by truncation. A novel, more robust method for parameter constraint is proposed, improving upon existing approaches.

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Area of Science:

  • Statistical genetics
  • Genetic epidemiology

Background:

  • Single ascertainment by truncation is a common issue in genetic studies.
  • Existing methods for correction may lack robustness.

Purpose of the Study:

  • To compare two established methods for correcting single ascertainment by truncation.
  • To propose a more robust alternative for parameter constraint in these methods.

Main Methods:

  • Comparison of two ascertainment correction methods: conditioning on proband phenotype versus conditioning on a phenotype threshold.
  • Evaluation of parameter constraint methods, including a critique of existing approaches.

Main Results:

  • The robustness of a specific parameter constraint method to misspecification was found to be limited.

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  • An alternative representation of information for parameter constraint is proposed, offering improved robustness.

    • Conclusions:

    • The proposed alternative parameter constraint method provides superior robustness compared to existing methods.
    • This work offers a more reliable approach to correcting for single ascertainment by truncation in genetic studies.