RE: st: Hurdle model

[Neil Hewitt <mcxnh4@nottingham.ac.uk>]

Thanks Jeph,

I have used a hurdle model not a zero inflated model as I believe all my zeros are real and not structural. All individuals in my panel have the same chronic condition, the outcome is related to that chronic condition and there is little/no chance of them having an event without it being recorded.

That is how I understand the difference between the two though will not profess to be an expert.

Thanks,

Neil 

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Jeph Herrin
Sent: 13 September 2013 09:51
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: Hurdle model

It sounds like what you have is a "zero inflated Poisson" model, not a hurdle model. Either way, I don't think there is a panel data version available (official or user written) for either in Stata. Almost certainly not for the hurdle model
- I needed to estimate some hurdle models for panel data recently and dug around a lot before finally/reluctantly running them in SAS.

Jeph



On 9/13/2013 4:19 AM, Neil Hewitt wrote:
> Dear Statalist users,
>
> Have any of you fitted a hurdle model to panel data?
>
> I know there are user written commands for non panel data and have seen applications of it to panel data in academic journals.
>
> They have all used a non zero count model telling me that each 
> individual starts each year in the panel in the dichotomous model. 
> This does not make sense with my data as I am looking at individuals 
> with a chronic disease and my outcome are hospital admissions for 
> serious conditions. Hence once they have had an event I have retained 
> them in the count model so my count model contains zeros. The example 
> below illustrates it
>
> ID	Year	Event(Binary)	Hurdle(Count)
> 1	1	0			.
> 1	2	0			.
> 1	3	0			.
> 2	1	1			1
> 2	2	.			0
> 2	3	.			2
>
> So once they have crossed the hurdle I have counted them in the count model and removed them from the binary model. Has anyone seen the hurdle model applied in such a way and does it seem reasonable?
>
> Many thanks for your time and hopefully your help/opinion.
>
> Neil
>
>
> This message and any attachment are intended solely for the addressee and may contain confidential information. If you have received this message in error, please send it back to me, and immediately delete it.   Please do not use, copy or disclose the information contained in this message or in any attachment.  Any views or opinions expressed by the author of this email do not necessarily reflect the views of the University of Nottingham.
>
> This message has been checked for viruses but the contents of an 
> attachment may still contain software viruses which could damage your computer system, you are advised to perform your own checks. Email communications with the University of Nottingham may be monitored as permitted by UK legislation.
>
>
>
>
>
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/faqs/resources/statalist-faq/
> *   http://www.ats.ucla.edu/stat/stata/
>
>
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/
This message and any attachment are intended solely for the addressee and may contain confidential information. If you have received this message in error, please send it back to me, and immediately delete it.   Please do not use, copy or disclose the information contained in this message or in any attachment.  Any views or opinions expressed by the author of this email do not necessarily reflect the views of the University of Nottingham.

This message has been checked for viruses but the contents of an attachment
may still contain software viruses which could damage your computer system, you are advised to perform your own checks. Email communications with the University of Nottingham may be monitored as permitted by UK legislation.





*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/