Question: How do I compute error rates using cross-validation to decide which is better between linear discriminant analysis and quadratic discriminant analysis. Please show this using

How do I compute error rates using cross-validation to decide which is better between linear discriminant analysis and quadratic discriminant analysis. Please show this using the Default data on R where default is the output variable and the rest are the inputs?

I tried using poly() function but don't understand how to apply this to a multiple linear regression.

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