Data Analysis with R, Second Edition - Second Edition

Exercises

Practise the following exercises to get a firm grasp on the concepts learned so far:

• Did you notice that I put CV in italics when I said that using k=27 seems like a safe bet as measured by the minimization of the CV error? Did you wonder why? I (quite deliberately) made a gaffe in choosing the k in the k-NN from Figure 10.4. My choice wasn't wrong, per se, but my choice of k may have been informed by data that should have been unavailable to me. How might have I committed a common but serious error in hyper-parameter tuning? How might I have done things differently?

• Remember that we spent a long time talking about the assumptions of linear regression? In contrast, we spent virtually no time discussing the assumptions of logistic ...