Stratified Fisher's exact test and its sample size calculation.

TitleStratified Fisher's exact test and its sample size calculation.
Publication TypeJournal Article
Year of Publication2014
AuthorsJung, Sin-Ho
JournalBiom J
Date Published2014 Jan
KeywordsBiometry, Clinical Trials as Topic, Probability, Sample Size

Chi-squared test has been a popular approach to the analysis of a 2 × 2 table when the sample sizes for the four cells are large. When the large sample assumption does not hold, however, we need an exact testing method such as Fisher's test. When the study population is heterogeneous, we often partition the subjects into multiple strata, so that each stratum consists of homogeneous subjects and hence the stratified analysis has an improved testing power. While Mantel-Haenszel test has been widely used as an extension of the chi-squared test to test on stratified 2 × 2 tables with a large-sample approximation, we have been lacking an extension of Fisher's test for stratified exact testing. In this paper, we discuss an exact testing method for stratified 2 × 2 tables that is simplified to the standard Fisher's test in single 2 × 2 table cases, and propose its sample size calculation method that can be useful for designing a study with rare cell frequencies.

Alternate JournalBiom J
Original PublicationStratified Fisher's exact test and its sample size calculation.
PubMed ID24395208
PubMed Central IDPMC3884832
Grant ListP01 CA142538 / CA / NCI NIH HHS / United States