Hi, I have two questions. First, I'd like to compare a ZINB model to a negativ binomial model with the Vuong test, but I can't find how to performe it from the zicount package. Does a programm exist to do it ? Second, I'd like to know in which cases we have to use a double hurdle model instead of a zero inflated model. Many thanks, St??phanie Payet REES France R??seau d'Evaluation en Economie de la Sant?? 28, rue d'Assas 75006 PARIS T??l. +33 (0)1 44 39 16 90 Fax +33 (0)1 44 39 16 92 M??l. reesfrance at wanadoo.fr Site Internet : http://www.rees-france.com
Vuong test
3 messages · Stéphanie PAYET, Seyed Reza Jafarzadeh
Hi St??phanie, The Vuong test can be done in Stata (http://www.stata.com/support/faqs/stat/vuong.html), but I am also looking for its code in R. In addition to "zicounts", Dr. Simon Jackman (http://pscl.stanford.edu/) has provided the code for fitting the zero-inflated (http://pscl.stanford.edu/zeroinfl.r) and hurdle (http://pscl.stanford.edu/hurdle.r) count models. Reza
On 5/17/05, St??phanie PAYET <spayet.reesfrance at wanadoo.fr> wrote:
Hi, I have two questions. First, I'd like to compare a ZINB model to a negativ binomial model with the Vuong test, but I can't find how to performe it from the zicount package. Does a programm exist to do it ? Second, I'd like to know in which cases we have to use a double hurdle model instead of a zero inflated model. Many thanks, St??phanie Payet REES France R??seau d'Evaluation en Economie de la Sant?? 28, rue d'Assas 75006 PARIS T??l. +33 (0)1 44 39 16 90 Fax +33 (0)1 44 39 16 92 M??l. reesfrance at wanadoo.fr Site Internet : http://www.rees-france.com
______________________________________________ R-help at stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Hi Reza, thanks for your answer. I have already used the code of Dr. Jackman for fitting the double hurdle model, but it doesn't allow to specify different regressors for the zero and the poisson (or negative binomial) parts, which is a bit limitative. Moreover, I don't have Stata, I just dispose of R and SAS. Does anybody know if the Vuong test also exist on these two pieces of software ? Best regards St??phanie -----Message d'origine----- De : Seyed Reza Jafarzadeh [mailto:srjafarzadeh at gmail.com] Envoy?? : mardi 17 mai 2005 10:59 ?? : spayet.reesfrance at wanadoo.fr Cc : r-help at stat.math.ethz.ch Objet : Re: [R] Vuong test Hi St??phanie, The Vuong test can be done in Stata (http://www.stata.com/support/faqs/stat/vuong.html), but I am also looking for its code in R. In addition to "zicounts", Dr. Simon Jackman (http://pscl.stanford.edu/) has provided the code for fitting the zero-inflated (http://pscl.stanford.edu/zeroinfl.r) and hurdle (http://pscl.stanford.edu/hurdle.r) count models. Reza
On 5/17/05, St??phanie PAYET <spayet.reesfrance at wanadoo.fr> wrote:
Hi, I have two questions. First, I'd like to compare a ZINB model to a negativ binomial model with the Vuong test, but I can't find how to performe it
from
the zicount package. Does a programm exist to do it ? Second, I'd like to know in which cases we have to use a double hurdle
model
instead of a zero inflated model. Many thanks, St??phanie Payet REES France R??seau d'Evaluation en Economie de la Sant?? 28, rue d'Assas 75006 PARIS T??l. +33 (0)1 44 39 16 90 Fax +33 (0)1 44 39 16 92 M??l. reesfrance at wanadoo.fr Site Internet : http://www.rees-france.com
______________________________________________ R-help at stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html