NUR 80A/B Chapter : Winter Week 7 - Analysis of Variance (ANOVA)
13 Dec 2011
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Winter week 7 - analysis of variance (anova) Used when there are more than 2 groups, groups are compared using their average (differences in means are compared, not relationships). The test statistic for anova is the f test. Anova breaks down total variability in a dependent variable into two parts: It helps the researcher decide if the difference in group means is related to the independent variable or due to other reasons (individual differences, measurement error etc). If the variance between the means of the groups is significantly greater than the variance within the groups, (calculated using an f- ratio) the probability is high that the iv has led to differences in group means. Simple analysis of variance (or one-way analysis of variance) There is one factor or treatment variable (such as group membership) being explored, and there are more than two levels within this factor. Also called the one-way analysis of variance because there is only one grouping dimension.
