Worksheet 26: Nearest Neighbors

Worksheet 26: Nearest Neighbors#

Your name:

Your student ID number:

  1. Your high school friend has just moved to the bay area. Your roommate wants you to set them up on a date. How do you decide if they will be compatible?

  2. What would your 1-nearest-neigbhor prediction be for the point xnew be? What would your 2-nearest-neighbor prediction be?

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  1. What do you notice about the k-nearest neighbor model prediction as k increases? Do you see a disadvantage to taking k too small? Do you see a disadvantage to taking k too large?

  2. Assume that only one example data point has features xi. If k=1, what will y^=f(xi) be?

  3. Brainstorm as many advantages and disadvantages as you can for using k-nearest neighbors vs. linear regression.