Data Quirk 2: Non-Normality
One assumption in multiple regression is that the
residuals are normally distributed (Williams, Grajales, &
Kurkiewicz, 2013). There are a variety of ways for the
residuals to fail to meet this assumption, but a common
one is for the outcome variable to have a non-normal
distribution, such as when it has excessive skew or
kurtosis. For the current example, I made Y's skew
equal to negative four and its kurtosis equal to seven. A
plot of such a variable is in Figure 6.
Data Quirk 2: Non-NormalityOne assumption in multiple regression is that theresiduals are normally distributed (Williams, Grajales, &Kurkiewicz, 2013). There are a variety of ways for theresiduals to fail to meet this assumption, but a commonone is for the outcome variable to have a non-normaldistribution, such as when it has excessive skew orkurtosis. For the current example, I made Y's skewequal to negative four and its kurtosis equal to seven. Aplot of such a variable is in Figure 6.
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