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linear model correlations of fixed effects
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| > summary(lm<-lm(wear~material-1,BHHshoes)) | |
| > X<-model.matrix(lm) | |
| > 2.49^2*solve(t(X)%*%X) | |
| materialA materialB | |
| materialA 0.62001 0.00000 | |
| materialB 0.00000 0.62001 |
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