Comparing means

You don't need to be Editor-In-Chief to add or edit content to WikiDoc. You can begin to add to or edit text on this WikiDoc page by clicking on the edit button at the top of this page. Next enter or edit the information that you would like to appear here. Once you are done editing, scroll down and click the Save page button at the bottom of the page.

Jump to: navigation, search

The following tables provide guidance to the selection of the proper parametric or non-parametric tests for a given data set.

Contents

Is there a difference ?

Ordinal and numerical measures
1 group N ≥ 30 One-sample t-test
N < 30 Normally distributed One-sample t-test
Not normal Sign test
2 groups Independent N ≥ 30 t-test
N < 30 Normally distributed t-test
Not normal Mann-Whitney U or Wilcoxon signed-rank test
Paired N ≥ 30 paired t-test
N < 30 Normally distributed paired t-test
Not normal Wilcoxon signed-rank test
3 or more groups Independent Normally distributed 1 factor One way anova
≥ 2 factors two or other anova
Not normal Kruskal-Wallis one-way analysis of variance by ranks
Dependent Normally distributed Repeated measures anova
Not normal Friedman two-way analysis of variance by ranks
Nominal measures
1 group np and n(1-p) ≥ 5 z-approximation
np or n(1-p) < 5 binominal
2 groups Independent np < 5 fisher exact test
np ≥ 5 chi-square test
Paired McNemar or Kappa
3 or more groups Independent np < 5 collapse categories for chi-square test
np ≥ 5 chi-square test
Dependent Cochran´s Q

Sources

See also

External links


WikiDoc Help Menu

Quick Start..

Editing basics

Advanced editing

Communicating your edits

Help Videos You Can Watch

Acknowledgement and Attribution Regarding Sources of Content

Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .

Retrieved from "http://www.wikidoc.org/index.php/Comparing_means"