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Re: st: Pooling Data


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Pooling Data
Date   Fri, 15 Apr 2011 00:52:40 +0100

I agree with Joerg. The question sems to be: I have measures for
variable y in area A and x in area B, and how can I compare them? I
can't see that you do anything without a cross-calibration between y
and x.

Nick

On Fri, Apr 15, 2011 at 12:48 AM, Joerg Luedicke
<joerg.luedicke@gmail.com> wrote:
> On Thu, Apr 14, 2011 at 7:23 PM, Clive Nicholas
> <clivelists@googlemail.com> wrote:
>> Dennis Kramer replied:
>>
>>> I am  attempting to compare the effectiveness of teachers in two
>>> districts (based on a common evaluation tool) where the student test
>>> scores outcomes are calculated differently. the first district
>>> calculates the scores on a cumulative gain index standardized across a
>>> number of factors and the other district uses a value-added index.
>>
>> I think I'll do my best impersonation of a David Greenberg posting and
>> say that, to me, your problem appears to cry out for a multilevel
>> modelling solution, perhaps via -gllamm-.
>>
>
> I do not know how a multilevel model would be of help here, besides
> there only being 2 districts, which is not enough anyway. But first
> and foremost, this seems to be a measurement problem. I do not know
> anything about these two indices but if they are picking up different
> stuff and one index cannot be translated into the other, I guess then
> the data from the two districts cannot be combined.

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