%plotit macro

a good document with graphic examples are here.
this one is more technical.

use %scan function to cycle through a list of items

There are many examples on line.  But I have difficulty to break from the loop following them in one SAS system.

model selection for mmrm

it seems glmselect cannot handle this. See a proposed procedure here.

Geometric Statistics, geometric CV, intra-subject variation

found from onbiostatistics and here. Additional discussion can be found here.
also for a log normal variable x, there are

y=log(x)~N(mu, sigma**2)
E(x)=exp(mu+sigma**2/2) and
sd(x)=exp(mu+sigma**2/2)*sqrt(exp(sigma**2)-1)

cv(x)=sqrt(exp(sigma**2)-1)