title: Information gain for genetic parameter estimation with incorporation of marker data.
abstract: Genetic marker data has been increasingly incorporated into segregation analysis, as combined segregation and linkage analysis has been performed more frequently. In this article, we study the extent of information gains with incorporation of marker data in segregation analysis, a topic that has not been investigated rigorously. Specifically, the current study is to investigate the influence of marker data on genetic model parameter estimation. A variance matrix criterion (as the inverse of the Fisher information matrix) and a relative entropy criterion (a measure of flatness of expected log-likelihood surface) are used to quantify the information gains. Our results indicate that substantial information gain can be achieved with the incorporation of marker data. The amount of variance reduction increases as the heterozygosity of the linked marker increases and as the trait gets closer to the linked marker(s). Incorporation of marker data in larger pedigrees also yields greater information gains based on both criteria. The effect of pedigree structure is also studied.
authors.affiliation: Center for Biostatistics, Ohio State University 1958 Neil Avenue, Columbus, Ohio 43210, USA.
authors.forename: Yuqun
authors.initials: Y
authors.lastname: Luo
authors.forename: Shili
authors.initials: S
authors.lastname: Lin
mesh_terms: D003627:Data Interpretation, Statistical; D005260:Female; D008040:Genetic Linkage; D005819:Genetic Markers; D020022:Genetic Predisposition to Disease; D005826:Genetics, Medical / Q000379:methods*; D006801:Humans; D008297:Male; D008957:Models, Genetic; D010375:Pedigree
chemical_list: D005819:Genetic Markers