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


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
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. 

Nick 
n.j.cox@durham.ac.uk 

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
(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.

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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