Pixel {lme4} | R Documentation |
The Pixel
data frame has 102 rows and 4 columns of data on the
pixel intensities of CT scans of dogs over time
This data frame contains the following columns:
1
to 10
designating the dog
on which the scan was made
L
and R
designating the side
of the dog being scanned
Pinheiro, J. C. and Bates, D. M. (2000) Mixed-effects Models in S and S-PLUS, Springer.
data(Pixel) ## Not run: Pixel$DS = getGroups(Pixel, ~ 1 | Dog/Side, level = 2) fm1 <- lme(pixel ~ day + I(day^2), data = Pixel, random = list(DS = ~ 1, Dog = ~ 1)) summary(fm1) VarCorr(fm1) ## End(Not run)