Introduction to Sociological Research_Kupchik_Date__041210

Introduction to Sociological Research_Kupchik_Date__041210...

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ANOVA (analysis of variance) tells us whether a continuous (i.e., ratio- or interval-level) dependent variable is related to a nominal or ordinal independent variable. In other words, we have more than two groups of cases, and we want to see if these groups are significantly different from one another on some continuous variable. Ex. Do people of different religious groups work different average numbers of hours per week? or, Do people of different racial/ethnic groups receive different average salaries? ANOVA determines the relationship between these two variables by comparing the variance among cases between groups to the variance within each group. The between group variance is a measure of how different our groups are from one another; the within group variance is our error term, or the variation in the dependent variable that is not accounted for by the groupings. Just like when we calculate the variance of a distribution, we use the sum of the squared distances from the mean in ANOVA. We compare the sum of squares between
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This note was uploaded on 08/30/2010 for the course SOCI 301 taught by Professor Kupchick during the Spring '09 term at University of Delaware.

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Introduction to Sociological Research_Kupchik_Date__041210...

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