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Related Concept Videos

Genome-wide Association Studies-GWAS01:11

Genome-wide Association Studies-GWAS

Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
GWAS does not require the identification of the target gene involved in...
Sign Test for Matched Pairs01:17

Sign Test for Matched Pairs

The sign test for matched pairs offers a robust method for comparing two paired samples, often for the effects of an intervention in one of them. This method is very useful in situations where the underlying distribution of the data is unknown. The test compares two related samples—often pre- and post-treatment measurements on the same subjects—to determine if there are significant differences in their median values.
To conduct the sign test, we first calculate the differences in value between...
Multiple Comparison Tests01:13

Multiple Comparison Tests

Multiple comparison test, abbreviated as MCT, is a post hoc analysis generally performed after comparing multiple samples with one or more tests. An MCT will help identify a significantly different sample among multiple samples or a factor among multiple factors.
It would be easy to compare two samples using a significance alpha level of 0.05. In other words, there is only one sample pair to be compared. However, it would be difficult to identify a significantly different sample if the number...
Test for Homogeneity01:23

Test for Homogeneity

The goodness–of–fit test can be used to decide whether a population fits a given distribution, but it will not suffice to decide whether two populations follow the same unknown distribution. A different test, called the test for homogeneity, can be used to conclude whether two populations have the same distribution. To calculate the test statistic for a test for homogeneity, follow the same procedure as with the test of independence. The hypotheses for the test for homogeneity can be stated as...

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Related Experiment Video

Updated: Jun 25, 2026

Candidate Gene Testing in Clinical Cohort Studies with Multiplexed Genotyping and Mass Spectrometry
05:53

Candidate Gene Testing in Clinical Cohort Studies with Multiplexed Genotyping and Mass Spectrometry

Published on: June 21, 2018

Robust tests for single-marker analysis in case-control genetic association studies.

Qizhai Li1, Gang Zheng, Xueying Liang

  • 1Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, MD 20892, USA.

Annals of Human Genetics
|February 12, 2009
PubMed
Summary

Selecting the right genetic association test is key for case-control studies. The MAX test demonstrates the most robust performance across various disease risk models compared to traditional methods.

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An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations
10:17

An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations

Published on: November 3, 2010

Related Experiment Videos

Last Updated: Jun 25, 2026

Candidate Gene Testing in Clinical Cohort Studies with Multiplexed Genotyping and Mass Spectrometry
05:53

Candidate Gene Testing in Clinical Cohort Studies with Multiplexed Genotyping and Mass Spectrometry

Published on: June 21, 2018

An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations
10:17

An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations

Published on: November 3, 2010

Area of Science:

  • Genetics
  • Statistical Genetics
  • Bioinformatics

Background:

  • Case-control genetic association studies are crucial for identifying disease-related genetic markers.
  • The performance of single-marker association tests can vary significantly depending on the underlying genetic architecture of the disease.
  • Robust statistical methods are needed to ensure reliable results across diverse disease risk models.

Purpose of the Study:

  • To derive the power calculation formula for the MAX (Marker Association Explorer) test.
  • To conduct a comprehensive power comparison of the MAX test against the Cochran-Armitage trend test and the Pearson chi2 test.
  • To evaluate the robustness of MAX across different genetic risk models.

Main Methods:

  • Derivation of the power calculation formula for the MAX test.
  • Simulation studies comparing the power of MAX, 1-df Cochran-Armitage trend test, and 2-df Pearson chi2 test.
  • Evaluation under both single-marker and two-marker (haplotype) disease risk models.

Main Results:

  • The power calculation formula for MAX was successfully derived.
  • Each of the three tested methods exhibited optimal performance under specific conditions ('sweet spots').
  • The MAX test demonstrated superior and more consistent robustness across a wider range of tested genetic risk models compared to the other two tests.

Conclusions:

  • The MAX test offers a robust approach for single-marker association analysis in genetic studies.
  • MAX provides a reliable alternative to traditional tests, particularly when the specific disease risk model is unknown.
  • The derived power formula facilitates better study design and interpretation of results when using the MAX test.