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Re: re: st: Package -r2c- now available in SSC


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: re: st: Package -r2c- now available in SSC
Date   Tue, 5 Feb 2013 18:46:44 +0000

There is generic discussion at

FAQ     . . . . . . . . . . . . . . .  User-written programs and Stata version
        . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox
        7/11    I have a certain version of Stata and have come
                across a user-written program that is apparently
                written for a later version of Stata. What are
                my options?
                http://www.stata.com/support/faqs/programming/
                user-written-programs-and-stata-version/

In a nutshell, the question is whether -r2c- really needs 12.1 or was
just developed under 12.1. You could live dangerously and clone the
program with a different -version- statement, but at your own risk. I
make no recommendations except suggesting that you read the FAQ above
if interested.

I note in passing that -r2c- evidently feels free to use the variable names

mu mumean wt _est_full counts alpha

so that it will -drop- any previous instances and then overwrite them
with new ones. This is not documented so far as I can see. Correct me
if I am wrong, such practices are widely regarded as dangerous Stata
programming style. Some of these names look highly likely to appeal to
people fitting count models.

Nick

On Tue, Feb 5, 2013 at 5:38 PM, Simon Falck <simon.falck@abe.kth.se> wrote:
> The -r2c- package is only available for users of Stata 12.x.
>
> I would be great if this interesting package will be made accessible to users of previous Stata versions (I am a user of Stata 11.2). To the wish list.
>
> Simon
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Ariel Linden, DrPH
> Sent: den 5 februari 2013 17:00
> To: statalist@hsphsun2.harvard.edu
> Subject: re: re: st: Package -r2c- now available in SSC
>
> That is very helpful information, Joe... thanks!
>
> Date: Mon, 4 Feb 2013 08:06:49 -0500
> From: Joseph Luchman <jluchman@gmail.com>
> Subject: re: st: Package -r2c- now available in SSC
>
> Hi Ariel,
>
>   Certainly.  To my understanding, -countfit- is mainly helpful for selecting a count model and uses the information criteria and predicted probabilities to do so.
>
>   I see the -r2c- as useful mainly for explanatory purposes following model selection and estimation and, although there is a statistic reported for negative binomial models (i.e., the DP r-square) that is intended to compare models, -r2c- is not intended for model selection purposes (though it can be used for that purpose if the analyst desires).
>
>   The indexes reported are all r-squares (of different flavors, though several lack properties such as "boundedness" between 0-1, that an r-square should possess) the recommended statistic, the deviance r-square is based on the model log likelihood and so it uses the same information as the AIC and BIC reported in -countfit-.  For what it's worth, the -r2c- also incorporates probability weights, an exposure/offset (both in the main count model, and the inflate model for zero-inflated models), and incorporates more of Stata's built-in count models (truncated counts, generalized negative binomial).

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