Question: How many models would we need to fit in order to exhaustively obtain theR M S P E RMSPE for every excluded chunk of sizen

How many models would we need to fit in order to exhaustively obtain theR

RMSPE

foreveryexcluded chunk of sizen

How many models would we need to fit in order to exhaustively

The method of LOOCV is not random because you t all 'n. possible models that leave out a single observation. The method of k-fold CV is random because we randomly split the data into '6: chunks. How many models would we need to t in order to exhaustively obtain the RMSPE for every excluded chunk of size E? Note: the following answers are all "combinations" (or "n choose x")

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