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st: inference on counts?


From   "Carlo Lazzaro" <carlo.lazzaro@tin.it>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: inference on counts?
Date   Wed, 30 May 2007 09:09:03 +0200

Dear All,
I beg Your pardon in advance for my probably trivial thread.

I would like to compare with Stata 9/2SE two samples (SDO 2003 vs. SDO 2004)
of discharge diagnoses Diagnosis Related Groups (DRG)codes and check for the
significance of the reduction occurred in inpatient hospitalizations (RO)
during 2003 ( 835,158) - 2004 (775,287).

As these data seem counts, I supposed they have something to deal with
Poisson distribution, but I would kindly ask You all for some hints on this
issue.




DRG codes					RO - SDO 2003    RO - SDO
2004
6						16,084		13,763
39						116,574		95,355
40						15,258            14,870 
119                                53,483             51,385 
134                                54,674              50,981 
162                                87,517              80,981

183                                134,501             124,971    	
222                                98,794              94,024	
270                                20,993              20,719 
284                                27,327              24,836
294                                39,715             37,320
301                                 24,453              22,264
364                                 38,591              33,639
395                                  43,887           42,530
467                                 63,307            67,649 

Total                               835,158            775,287


Any suggestion will be highly appreciated.


Thanks a lot for Your Kindness and for Your time.

Kind Regards,

Carlo

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