Hi,

I am trying to model a score over time. This score shows a ceiling effect. I was 
willing to use a longitudinal tobit model, such as the one described by Twisk et 
al. (Twisk_Longitudinal tobit regression: A new approach to analyze outcome 
variables with floor or ceiling effects_JCE_2009) but it is programmed for 
STATA.

Has anyone used such models in R?
Any other idea?

David Biau.


      
	[[alternative HTML version deleted]]

