Stata The Stata listserver
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

st: Re: truncation and endogenous stratification in TCM


From   "Scott Merryman" <[email protected]>
To   <[email protected]>
Subject   st: Re: truncation and endogenous stratification in TCM
Date   Tue, 6 May 2003 21:40:43 -0500

----- Original Message -----
From: "0087209s" <[email protected]>
To: <[email protected]>
Sent: Tuesday, May 06, 2003 5:54 AM
Subject: st: truncation and endogenous stratification in TCM


> I am trying to estimate a travel cost model for whitewater recreation
using
> the usual negative binomial distribution. My sample is from an on-site
survey
> so I need to take into account the fact that my observations are truncated
at
> positive trip demand as people who have not visited the river are not
included
> and also the problem of endogenous stratification (the likelihood of being
> sampled depends on the frequency of visiting the site).
>
> my question is how I might take these 2 factors into account  using the
nbreg
> function (negative binomial distribution)within Stata? Is there some
optional
> command that I can use along with nbreg?
>
> Thanks for the help,
>
> Stephen
>
Hilbe's -trnbin0-  (0-truncated negative binomial regression) will deal with
the first problem.  You can use -findit- to download the program.

Hope this helps,
Scott




*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



© Copyright 1996–2024 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index