When is it appropriate to use polynomial regression?
- When the dependent variable is categorical
- When the relationship between variables is linear
- When the relationship between variables is non-linear
- When there is no relationship between variables
Polynomial regression is appropriate when the relationship between variables is non-linear. It allows for modeling of relationships that change in direction at different levels of the independent variables, which can be useful when dealing with complex data sets that do not follow a simple linear relationship.
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