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


From   David Bell <dcbell@iupui.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: RE: Stata equivalent of SAS "Proc Traj"?
Date   Fri, 13 Feb 2009 14:29:27 -0500

***
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.

Dave
====================================
David C. Bell
Professor of Sociology
Indiana University Purdue University Indianapolis (IUPUI)
(317) 278-1336
====================================




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.

JH


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu ] On Behalf Of Ariel Linden
Sent: Thursday, February 12, 2009 8:37 PM
To: statalist@hsphsun2.harvard.edu
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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