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RE: st: RE: Stata equivalent of SAS "Proc Traj"?

From   "Nick Cox" <>
To   <>
Subject   RE: st: RE: Stata equivalent of SAS "Proc Traj"?
Date   Fri, 13 Feb 2009 19:35:08 -0000

Not knowing either person (Prof. Jones) or circumstance, that all sounds
very natural to me. For example, I don't imagine that most Stata
programmers have any inclination to rewrite their programs in SAS, even
setting aside the small detail that many of us don't even know SAS. 


David Bell

When I took Nagin's Developmental Trajectory workshop, I asked Jones  
to convert the program for Stata.  He did not show the requisite  
enthusiasm for redoing something he had already done for SAS.

I would be extremely enthusiastic if someone would take up the task  
for Stata.

On Feb 13, 2009, at 11:49 AM, John Hoffmann wrote:

> 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
> ). Also, given that the procedure is implemented as a SAS macro, it  
> shouldn't be too hard to write equivalent code for Stata.

Ariel Linden

> 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.

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