title: 2 × 2 Tables: a note on Campbell's recommendation.
abstract: For 2 × 2 tables, Egon Pearson's N - 1 chi-squared statistic is theoretically more sound than Karl Pearson's chi-squared statistic, and provides more accurate p values. Moreover, Egon Pearson's N - 1 chi-squared statistic is equal to the Mantel-Haenszel chi-squared statistic for a single 2 × 2 table, and as such, is often available in statistical software packages like SPSS, SAS, Stata, or R, which facilitates compliance with Ian Campbell's recommendations.
authors.affiliation: Psychological Institute, Leiden University, the Netherlands.
authors.forename: F M T A
authors.initials: FM
authors.lastname: Busing
authors.affiliation: Centre for Research on Safe Driving, Lakehead University 955 Oliver Road, Thunder Bay, ON Canada P7B 5E1; Northern Ontario School of Medicine, Human Sciences Division, 955 Oliver Road, Thunder Bay, ON, Canada P7B 5E1.
authors.forename: B
authors.initials: B
authors.lastname: Weaver
authors.affiliation: Centre for Research on Safe Driving, Lakehead University 955 Oliver Road, Thunder Bay, ON Canada P7B 5E1; Northern Ontario School of Medicine, Human Sciences Division, 955 Oliver Road, Thunder Bay, ON, Canada P7B 5E1.|Centre for Applied Health Research, St. Joseph's Care Group, 580 Algoma St. N, Thunder Bay, Ontario, Canada, P7B 5G4.
authors.forename: S
authors.initials: S
authors.lastname: Dubois
mesh_terms: D056808:Biostatistics / Q000379:methods*; D016009:Chi-Square Distribution; D006801:Humans; D015233:Models, Statistical; D012984:Software
keywords: Mantel-Haenszel chi-squared statistic; N − 1 chi-squared statistic; Pearson's chi-squared statistics; R; SAS; SPSS; Stata; r; statistical software; χ2; ϕ