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st: Fw: Negative binomial regression and Incident rate ratio(IRR)


From   Muhammad Riaz <citriaz@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Fw: Negative binomial regression and Incident rate ratio(IRR)
Date   Wed, 2 Sep 2009 04:41:38 -0700 (PDT)

Hi,
I am resending this query if somebody could help with, I sent it yesterday but did not get any response. 

Adding further my query given below, my dependent variable is count (0-9) based on certain scale, i mean the dependent variable measure counts of 9 items for each individual,  these counts are given in the table as:

d_cap       |
            |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        449       38.71       38.71
          1 |        214       18.45       57.16
          2 |        163       14.05       71.21
          3 |        112        9.66       80.86
          4 |         89        7.67       88.53
          5 |         56        4.83       93.36
          6 |         41        3.53       96.90
          7 |         18        1.55       98.45
          8 |         12        1.03       99.48
          9 |          6        0.52      100.00
------------+-----------------------------------
      Total |      1,160      100.00


Can we fit a regression model with negative binomial distribution? 
How can we compute the Incident rate ratio?


--- On Tue, 9/1/09, Muhammad Riaz <citriaz@yahoo.com> wrote:

> From: Muhammad Riaz <citriaz@yahoo.com>
> Subject: Negative binomial regression and Incident rate ratio(IRR)
> To: statalist@hsphsun2.harvard.edu
> Date: Tuesday, September 1, 2009, 3:22 PM
> Dear All,
> I am trying to fit a model for count data using Negative
> binomial regression, it gives incident rate ratios for the
> variables in the model, one of the options for this type of
> model is specifying the offset variable while fitting the
> model in stata using glm. This offset should be the person
> years (if i am correct). however I do not have data on this
> variable. My question is:
>  
> Is it correct to fit the model without an offset and would
> the Incident rate ratio be still correct to report If I do
> not specify the offset variable in the model?
>  
> I will really appreciate any help.
>  
> Thank you,
>  
> M Riaz
>  
> 
> 
> 
> 


      

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