Genetic Epidemiology. The 18 presentation groups were organized around common methodological issues: comparisons of SNPs versus microsatellite markers in linkage studies, integration of SNPs and microsatellites in linkage and association studies, linkage mapping methods, quantitative trait mapping, fine mapping, methods for generating haplotypes and identifying haplotype-tagging SNPs, approaches to dealing with linkage disequilibrium, methods for association mapping, methods for case-control analysis and multivariate analyses, applications of these methods to analysis of alcoholism, smoking and related traits in the COGA data, methods for data mining, methods for dealing with genetic heterogeneity, methods for detecting gene × gene interaction, approaches to dealing with genotyping errors, pedigree errors and missing data, and methods to test for parent of origin, genomic imprinting, mitochondrial and X-linked effects in genome scans. Each presentation group met individually during the workshop and members of most groups communicated beforehand to begin comparing and contrasting the approaches taken and the results obtained by group members. At GAW14, many groups used part of their group meeting time to allow individual investigators to present their work. These group meetings were mostly attended by group participants but were open to all GAW14 attendees. From this process, each group developed an oral presentation, summarizing
