![]() We look for an even spread of residuals along the Y axis for each of the levels in the X axis. Heterogenous variances are indicated by a non-random pattern in the residuals vs fitted plot. ![]() To conduct a visual inspection of the residuals we simply use the following: plot(weeds.aov, 1) # using plot number 1 this time Similar to the assumption of normality, there are two ways to test homogeneity, a visual inspection of residuals and a statistical test. That is to say, all groups have similar variation between them. Homogeneity of variance is the assumption that the variance between groups is relatively even. ![]() Homogeneity of variance is the other main assumption we are concerned with when conducting an ANOVA. Built with the "Learn" Theme using Hugo and Blogdown
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