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Re: re; st: Pweight

From   "Gao Liu" <[email protected]>
To   [email protected]
Subject   Re: re; st: Pweight
Date   Thu, 18 Sep 2008 11:15:22 -0400

Thanks, Steve and Austin,

I did check the help for weight,but had not much idea which type of
weight, if any,  is appropriate. It is my first time to deal with
weight option.

Austin's suggestion is great. I'll check how it works. Any other
suggestions will be welcome



On Thu, Sep 18, 2008 at 10:22 AM, Steven Samuels
<[email protected]> wrote:
>> "Should we use the pweight option in the regression?"
> It appears that Gao did not consult -help weight-, where there is a clear
> answer to his question.
> -Steve
>> "Gao Liu" <[email protected]> wrote:
>>> We are estimating the impact of an intervention on the practice of
>>> health providers.  One outcome measure is the ratio of metformin
>>> prescribed to diabetic patients. This ratio is defined as the ratio
>>> between the number of diabetic patients prescribed with metformin and
>>> the total number of diabetic patients treated by the provider. We try
>>> to examine whether metformin ratios are different for treatment group
>>> and unexposed group before and after the intervention date. Xtgee is
>>> used to estimate the impact of the intervention.
>>> But there is a problem: the number of diabetic patients varies a lot
>>> from one provider to another.  Some had only one or two diabetic
>>> patients in a quarter, while others had more than 50. If a provider
>>> has only 2 diabetic patients, one of whom was prescribed with
>>> Metformin, then one patient's drop from being prescribed with
>>> metformin would lead to a change of 50% in the metformin ratio.  In
>>> contrast, a health provider with 100 diabetic patients will have very
>>> stable metformin ratio. Thus, it is inappropriate to treat all
>>> providers the same in the regression.
>>> Should we use the pweight option in the regression? Or is there any
>>> other better approach that works for this study? Thank you
> Be
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