I don't think an equivalent Stata procedure has been written, although I could be wrong. Jones, one of the developers of Proc Traj, has a website that might be useful (http://www.andrew.cmu.edu/user/bjones/index.htm). Also, given that the procedure is implemented as a SAS macro, it shouldn't be too hard to write equivalent code for Stata.
JH
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Ariel Linden
Sent: Thursday, February 12, 2009 8:37 PM
To: [email protected]
Subject: st: Stata equivalent of SAS "Proc Traj"?
Hi all,
There is a user-written program for SAS called "Proc Traj" which uses a
semi-parametric approach to categorize individuals into groups based on
their longitudinal trajectories.
Is there similar procedure for us Stata folk?
Here are the references:
Jones, B. L., & Nagin, D. S. (2007). Advances in group-based trajectory
modeling and an SAS procedure for estimating them. Sociological Methods &
Research, 35, 542-571.
Jones, B., Nagin, D. S., & Roeder, K. (2001). A SAS procedure based on
mixture models for estimating developmental trajectories. Sociological
Research and Methods, 29, 374-393.
Thanks!
Ariel
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