cs-5821/notes

https://cran.r-project.org/web/packages/corrplot/vignettes/corrplot-intro.html

https://rpubs.com/toleafar/210620

https://www.r-bloggers.com/using-apply-sapply-lapply-in-r/

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
aded notes and new answers to hw 1 2017-01-25 04:08:33 +00:00			`https://cran.r-project.org/web/packages/corrplot/vignettes/corrplot-intro.html`

			`https://rpubs.com/toleafar/210620`

			`https://www.r-bloggers.com/using-apply-sapply-lapply-in-r/`

added notes 2017-01-23 10:18:56 +00:00			`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`