title: Two tests of association for a susceptibility locus for families of variable size: an example using two sampling strategies.
abstract: A two-stage approach was used to analyze Problem 2 simulated data from Genetic Analysis Workshop 11. In the first stage, we tested for linkage with the Haseman-Elston test in SIBPAL. Markers that were significant in the first stage were followed up with two types of association tests. These association tests differ in the type of family information used: 1) parental transmissions to affected children or 2) differences in marker allele frequencies between affected and unaffected siblings. We also explored how the conclusions changed when different sampling strategies were used. Of particular interest was whether the entire data set should be used to test for both linkage and association or whether the data set should be halved to allow for replication of the initial association results.
authors.affiliation: Department of Statistics, North Carolina State University, Raleigh, USA.
authors.forename: S A
authors.initials: SA
authors.lastname: Monks
authors.forename: E R
authors.initials: ER
authors.lastname: Martin
authors.forename: D M
authors.initials: DM
authors.lastname: Umbach
authors.forename: N L
authors.initials: NL
authors.lastname: Kaplan
mesh_terms: D004777:Environment; D005190:Family; D008040:Genetic Linkage; D005819:Genetic Markers; D020022:Genetic Predisposition to Disease; D005820:Genetic Testing; D006801:Humans; D015810:Linkage Disequilibrium; D008957:Models, Genetic; D009010:Monte Carlo Method; D012984:Software
chemical_list: D005819:Genetic Markers