title: A confidence interval for the ratio of treatment variances in a two-by-two crossover study.
abstract: The distance between two variances is usually measured using the ratio, and a confidence interval for this ratio can be used to measure its magnitude. For a two-by-two crossover study, special considerations must be made because the observations for any subject are correlated. Here a confidence interval for the ratio of the treatment variances in a two-by-two crossover study is presented.
authors.affiliation: Janssen Research Foundation Inc., Piscataway, New Jersey 08855.
authors.forename: D R
authors.initials: DR
authors.lastname: Bristol
mesh_terms: D000704:Analysis of Variance; D002986:Clinical Trials as Topic / Q000379:methods / Q000706:statistics & numerical data*; D016001:Confidence Intervals; D004358:Drug Therapy / Q000706:statistics & numerical data*; D006801:Humans; D012107:Research Design / Q000706:statistics & numerical data