title: Extending nondirectional heterogeneity tests to evaluate simply ordered alternative hypotheses.
abstract: Biologists frequently use nondirectional heterogeneity tests when comparing three or more populations because a suitable directional test is unavailable or is not practical to implement. Here we describe a test, the ordered heterogeneity test, that permits testing against simply ordered alternative hypotheses in the context of almost any nondirectional test. The test has a wide range of parametric and nonparametric applications. Graphs are developed for calculating exact P values.
authors.affiliation: Biology Department, University of California, Santa Cruz 95064.
authors.forename: W R
authors.initials: WR
authors.lastname: Rice
authors.forename: S D
authors.initials: SD
authors.lastname: Gaines
mesh_terms: D005828:Genetics, Population; D013223:Statistics as Topic / Q000379:methods*