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Re: st: HLM and SUR

From   Nick Cox <>
Subject   Re: st: HLM and SUR
Date   Mon, 26 Nov 2012 13:25:40 +0000

If you think that -xtmixed- is the appropriate modelling command,
linear regression can hardly be a good substitute.

Conversely, if this makes sense to you why not try it?


On Mon, Nov 26, 2012 at 12:31 PM, KOTa <> wrote:
> thanks. is it the only way?
> in my case it's not really feasible, as i have both lots and various
> number of observations within each cluster/group by which i split data
> for HLM. so reshaping into wide is problematic.
> how problematic (in terms of using the results of such analysis) would
> be to use .sureg and simple linear regression instead of xtmixed for
> such data?
> i mean would those results be "correct" ?

> On Mon, Nov 26, 2012 at 2:09 PM, Maarten Buis <> wrote:
>> On Mon, Nov 26, 2012 at 12:36 PM, Constantin Alba wrote:
>>> is it possible to use SUR (seemingly unrelated regression) with HLM models?
>>> i have to 2 HLM models that i run separately where independent variables
>>> are same, and DV are different. Is there a way to run SUR while keeping HLM
>>> models intact?
>> Both SUR and HLM can be seen as special cases of a SEM (see:
>> <>),
>> so you can probably, with quite a bit of creative data preparation and
>> modeling, estimate such a model using -sem-.
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