qmst notes5 - Analysis of Categorical Data-An ANOVA is used...

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Analysis of Categorical Data - An ANOVA is used to determine if 2 or more groups are different. With a dependent variable measured on an interval or ration scale. Know the different scale used for measurement for the test. A t-test is used to determine if 2 groups are different. With a dependent variable measured on an interval or ratio scale. A chi-square test is used to determine if 2 or more groups are different. With a dependent variable measured on a nominal scale. A Mann-Whitney U Test is used to determine if 2 groups independent of each other are different. With a dependent variable measured on an ordinal scale, the groups must be independent of each other. Cannot perform a Mann-Whitney U Test in Excel, must use SPSS, Go to: Analyze, Nonparametric Tests, 2 Independent Samples, Look at the [Asymp. Sig (2-tailed)] result and treat it as a p-value if it is less than .05 you reject the null hypothesis or you do not reject if larger. Wilcoxon Matched Pairs Signed Rank Test -Use if the data are related. Good for before-and-after studies. Cannot perform a Wilcoxon test in Excel, must use SPSS, Go to: Analyze, Nonparametric Tests, 2 Related Samples, Look at the [Asymp. Sig (2-tailed)] result and treat it as a p-value if it is less than .05 you reject the null hypothesis or you do not reject if larger. Kruskal-Wallis Test -Use like an ANOVA when you want to determine if three are differences among> 2 groups, but data measured on an ordinal scale. Groups should not be
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This note was uploaded on 01/26/2012 for the course QMST 2333 taught by Professor Mendez during the Spring '08 term at Texas State.

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qmst notes5 - Analysis of Categorical Data-An ANOVA is used...

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