Pixel {MEMSS} | 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:
a factor with levels A
to J
designating the dog
on which the scan was made
a factor with levels L
and R
designating the side
of the dog being scanned
a numeric vector giving the day post injection of the contrast on which the scan was made
a numeric vector of pixel intensities
Pinheiro, J. C. and Bates, D. M. (2000) Mixed-effects Models in S and S-PLUS, Springer.
options(show.signif.stars = FALSE) str(Pixel) summary(Pixel) (fm1 <- lmer(pixel ~ day + I(day^2) + (1|Dog:Side) + (day|Dog), Pixel))