Question: Part ( d ) Find k for which the out - of - sample root mean squared error is the smallest. You can use which.min

Part (d)
Find k for which the out-of-sample root mean squared error is the smallest. You can use which.min(outRMSE) to find the index of the smallest value in the vector outRMSE.
Create variable kbest that stores the value k for which outRMSE has the smallest val

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