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- Title
WHAP: haplotype-based association analysis.
- Authors
Shaun Purcell; Mark J. Daly; Pak C. Sham
- Abstract
Summary: We describe a software tool to perform haplotype-based association analysis, for quantitative and qualitative traits, in population and family samples, using single nucleotide polymorphism or multiallelic marker data. A range of tests is offered: omnibus and haplotype-specific tests; prospective and retrospective likelihoods; covariates and moderators; sliding window analyses; permutation P-values. We focus on the ability to flexibly impose constraints on haplotype effects, which allows for a range of conditional haplotype-based likelihood ratio tests: for example, whether an allele has an effect independent of its haplotypic background, or whether a single variant can explain the overall association at a locus. We illustrate using these tests to dissect a multi-locus association.Availability: WHAP is a C/C++ program, freely available from the author's website: http://pngu.mgh.harvard.edu/purcell/whap/Contact:shaun@pngu.mgh.harvard.edu
- Publication
Bioinformatics, 2007, Vol 23, Issue 2, p255
- ISSN
1367-4803
- Publication type
Academic Journal
- DOI
10.1093/bioinformatics/btl580