... foreach of the mother and father, and a code for sex (typically m and f or 1 and 2). In addition, trait and marker information are included. It is the combinationof family ID and individual ID that ... Nath, S. K., Fallin, D., and Chakravarti, A. (2000) Linkage disequilib-rium analysis of biallelic DNA markers, human quantitative trait loci, and threshold-defined case and control subjects Am. ... mapping of a quantitative- trait locus in anexpanding population. Am. J. Hum. Genet. 64, 1765–1773.18. Tregouet, D A., Ducimetiere, P., and Tiret, L. (1997) Testing association betweencandidate-gene...