The Chi | chi-square test
WhatisaChi-squaretest?AChi-squaretestisahypothesistestingmethod.TwocommonChi-squaretestsinvolvecheckingifobservedfrequenciesinoneormorecategoriesmatchexpectedfrequencies.IsaChi-squaretestthesameasaχ²test?Yes,χistheGreeksymbolChi.Whataremychoices?Ifyouhaveasinglemeasurementvariable,youuseaChi-squaregoodnessoffittest[1].Ifyouhavetwomeasurementvariables,youuseaChi-squaretestofindependence[2].ThereareotherChi-squaretests,butthesetwoarethemostcommon.TypesofChi-squaretestsYouuseaChi-squaretestforh...
What is a Chi-square test?A Chi-square test is a hypothesis testing method. Two common Chi-square tests involve checking if observed frequencies in one or more categories match expected frequencies.
Is a Chi-square test the same as a χ² test?Yes, χ is the Greek symbol Chi.
What are my choices?If you have a single measurement variable, you use a Chi-square goodness of fit test[1]. If you have two measurement variables, you use a Chi-square test of independence[2]. There are other Chi-square tests, but these two are the most common.
Types of Chi-square testsYou use a Chi-square test for hypothesis tests about whether your data is as expected. The basic idea behind the test is to compare the observed values in your data to the expected values that you would see if the null hypothesis is true.
There are two commonly used Chi-square tests: the Chi-square goodness of fit test[3] and the Chi-square test of independence[4]. Both tests involve vari...