POWER CALCULATOR FOR GENETIC ASSOCIATION STUDIES

Statistical power calculations inform the design and interpretation of genetic association studies, but few programs are tailored to case-control studies of single nucleotide polymorphisms (SNPs) in unrelated subjects. The authors developed the “Power for Genetic Association analyses” (PGA) package, which comprises algorithms and graphical user interfaces for sample size and minimum detectable risk calculations using SNP or haplotype effects under different genetic models and study constraints. The software accounts for linkage disequilibrium and statistical multiple comparisons. The results are presented in graphs or tables and can be printed or exported in standard file formats. PGA is user-friendly software that can facilitate decision making for association studies of candidate genes, fine-mapping studies, and whole-genome scans. Stand-alone executable files and a Matlab toolbox are available for download at http://dceg.cancer.gov/bb/tools/pga. (Menashe I, Rosenberg PS, Chen BE. PGA: Power calculator for case-control genetic association analyses. BMC Genet 2008;9:36)