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
[email protected]
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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