added notes

2024-11-24 11:15:06 +00:00 · 2017-01-23 05:18:56 -05:00 · 2017-01-23 05:18:56 -05:00 · 5227328489
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 1. (a) 
 To test the quality of a regression fit use mean squared error.
       1   ₙ
 MSE = ───  ∑ (yᵢ - f̂(xᵢ))² 
       n   ⁱ⁼¹
 Ave(y₀ - f(x₀))²
 To test the quality of a model in the classification settings, use the error rate:
         1   ₙ
    E = ─── ∑ I(yᵢ ≠ ŷᵢ)
         n   ⁱ⁼¹