Linear Regression

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6 Terms

1
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What is residual error?

Y-Ŷ

2
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How to calculate SSt

Σ(Y-Ȳ)2

  1. Subtract mean Ȳ from individual Y value

  2. Square

  3. Add together

3
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How to calculate SSr

Σ(Y-Ŷ)2

  1. Subtract predicted Ŷ from actual Y value

  2. Square

  3. Add together

4
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How to calculate SSm

Σ(Ŷ-Ȳ)2

  1. Subtract mean Ȳ from predicted Ŷ

  2. Square

  3. Add together

5
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How to calculate regression coefficient

by,x = rx,y ⋅ (Sx ⋅ Sy)

  1. Multiply correlation coefficient by

  2. Standard deviation of x by Standard deciation of y

6
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How to do set normalisation

Zx = (x-x̄) / σx

  1. subtract mean of x by x

  2. divide by standard deviation of x

  3. shows someone’s SD in relation to the mean