Clarify usage of the 0.2 standard deviation criterion in Chapter 7 Q10

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Notes and exercise attempts for "An Introduction to Statistical Learning"

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Clarify usage of the 0.2 standard deviation criterion in Chapter 7 Q10 #109

Open leowang396 opened 4 years ago

leowang396 commented 4 years ago

In the proposed answer to part a, 0.2 standard deviation of optimum is used to demarcate the range of acceptable evaluation metrics. Is there any evidence to support why 0.2? It appears rather arbitrary to me.