Whereas partial derivatives are indicated with the “partial symbol,” we never see this notation when we’re dealing with ordinary derivatives. That’s because an ordinary derivative is the derivative of a function in a single variable. Because there’s only one variable, there’s no need to indicate the partial derivative for one variable versus another.
Read MoreIn general, chi square tests let you investigate the relationship between categorical variables. For instance the chi square test for homogeneity is a test you can use to determine whether the probability distributions for two different groups are homogeneous. Whereas the chi square test for association lets you determine whether two variables are related in the same group.
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