Chi | easy chi square
Tutorial:PearsonsChi-squareTestforIndependenceLing300,Fall2008WhatistheChi-squaretestfor?TheChi-squaretestisintendedtotesthowlikelyitisthatanobserveddistributionisduetochance.Itisalsocalleda"goodnessoffit"statistic,becauseitmeasureshowwelltheobserveddistributionofdatafitswiththedistributionthatisexpectedifthevariablesareindependent.AChi-squaretestisdesignedtoanalyzecategoricaldata.Thatmeansthatthedatahasbeencountedanddividedintocategories.Itwillnotworkwithparametricorcontinuousdata(suchashei...
Tutorial: Pearsons Chi-square Test for Independence Ling 300, Fall 2008 What is the Chi-square test for?The Chi-square test is intended to test how likely it is that an observed distribution is due to chance. It is also called a "goodness of fit" statistic, because it measures how well the observed distribution of data fits with the distribution that is expected if the variables are independent.
A Chi-square test is designed to analyze categorical data. That means that the data has been counted and divided into categories. It will not work with parametric or continuous data (such as height in inches). For example, if you want to test whether attending class influences how students perform on an exam, using test scores (from 0-100) as data would not be appropriate for a Chi-square test. However, arranging students into the categories "Pass" and "Fail" would. Additionally, the data in a Chi-square grid should not be in the form of percentages, or anything other than ...