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Re: st: crossed 4-level linear analysis


From   Amir Sariaslan <amir.sariaslan@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: crossed 4-level linear analysis
Date   Tue, 12 Jul 2011 12:24:56 +0200

Juliette,

I'm not clear as to how you came to the conclusion that Stata could
not fit the four crossed random effects. Given your relatively small
sample size, I am thinking that you might not have enough variability
for all of your random effects. You may also want to check out gllamm,
as suggested by Neil.

Sincerely,
Amir

On Tue, Jul 12, 2011 at 12:11 PM, Hommes Juliette (EDUC)
<juliette.hommes@maastrichtuniversity.nl> wrote:
> Dear Amir,
>
> In the first module n=296 and in the second, n=326.
>
> Thanks for your help,
>
> Juliette
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Amir Sariaslan
> Sent: dinsdag 12 juli 2011 12:09
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: crossed 4-level linear analysis
>
> Juliette,
>
> What's your sample size?
>
> Sincerely,
> Amir
>
> On Tue, Jul 12, 2011 at 11:24 AM, Hommes Juliette (EDUC)
> <juliette.hommes@maastrichtuniversity.nl> wrote:
>> L.S.,
>>
>> With great enthusiasm I've worked with STATA but now I've come across a problem that I cannot resolve so far. Therefore I hope you can give me a hand.
>>
>> I've collected repeated measurements (2) in two modules. Participants enrolled in the first module and were divided in groups randomly (n=30). After finishing the first module, the participants are again randomly assigned to groups (n=32). As such I've got four levels in my data structure with "crossed"data among the students/group levels: 1) Repeated measures, 2) Modules, 3) Students, 4) Groups.
>>
>> I've been using the xtmixed command, but I found that it could only be used for three levelled datasets (and/or crossed data). Do you have an idea to analyse the four levels in one model and account for the crossed nature of the data in STATA?
>>
>> Thank you very much for your help.
>>
>> Juliette
>> Maastricht University, The Netherlands
>>
>>
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