Wednesday, November 30 Analysis of Variance.

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Wednesday, November 30 Analysis of Variance

The Analysis of Variance Wednesday, November 30 The Analysis of Variance

The Analysis of Variance Wednesday, November 30 The Analysis of Variance ANOVA

Corn!

F = Between-group variance estimate within-group variance estimate _ SST =  (X - XG)2 SSB =  Ni (Xi - XG)2 SSW =  (X1 - X1)2 +  (X2 - X2)2 + ••••  (Xk - Xk)2 SST = SSB + SSW _ _ _ _ _

F = Between-group variance estimate within-group variance estimate MSB = SSB / dfB MSW = SSW / dfW where dfB = k-1 (k = number of groups) dfW = N - k

Fisher’s Protected t-test Xi - Xj MSW ( 1/Ni + 1/Nj) _ Where df = N - k