[R] Search for a usable pan manual

[Matthias Bindernagel]

Hello,

I'm looking for a more descriptive manual/tutorial/paper for the pan package. 
The provided manual and example do not contain any useful hints how to 
specify a model with more than one variable and leaves several questions 
unanswered. This also applies to the referred paper "Schafer: Imputation of 
missing covariates under a multivariate linear mixed model."

Can anyone point me to appropriate ressources providing a more in-depth view 
on this topic?

Regards,
Matthias