title: Nonparametric tests for interaction and group differences in a two-way layout.
abstract: Nonparametric tests of group differences and interaction across strata are developed in which the null hypotheses for these tests are expressed as functions of rho i = P(X > Y) + 1/2P(X = Y), where X refers to a random observation from one group and Y refers to a random observation from the other group within stratum i. The estimator r of the parameter rho is shown to be a useful way to summarize and examine data for ordinal and continuous data.
authors.affiliation: Enzon, Inc. South Plainfield, New Jersey 07080.
authors.forename: A C
authors.initials: AC
authors.lastname: Fisher
authors.forename: S
authors.initials: S
authors.lastname: Wallenstein
mesh_terms: D004358:Drug Therapy / Q000706:statistics & numerical data*; D006801:Humans; D015337:Multicenter Studies as Topic / Q000706:statistics & numerical data; D012107:Research Design / Q000706:statistics & numerical data*