[R] finding trajectories

[werlen]

hello R-users,

i like to know if there exists a tool in R to find different 
trajectories of a variable in a dataset with three resp. four points of 
measurement.
i search something like PROC TRAJ for SAS, but i don't have SAS nor do i 
know to use it. other alternatives would be M-plus or latent gold. (but 
actually i don't want to learn the use of M-plus or latent gold.)
what i think as an important element of PROC TRAJ is the calculation of 
BIC, a criterion to decide what number of trajectories fitting best the 
data.

thanks for every help.

-- 
Egon Werlen
Fachpsychologe fuer Gesundheitspsychologie FSP

Forschungszentrum fuer Rehabilitations- und Gesundheitspsychologie
Universitaet Freiburg
Englisberg 7
CH-1763 Granges-Paccot

Tel: +41 (0)26 300 76 60
Fax: +41 (0)26 300 96 34