st: Hurdle model

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

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


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