Pixel {nlme} | 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.
fm1 <- lme(pixel ~ day + I(day^2), data = Pixel, random = list(Dog = ~ day, Side = ~ 1)) summary(fm1) VarCorr(fm1)