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st: clustering and log likelihood.


From   Elin Vimefall <Elin.Vimefall@oru.se>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: clustering and log likelihood.
Date   Thu, 7 Mar 2013 07:54:21 +0000

Hi

I'm running a probit model like:
probit enrol x1 x2 [pweight=weight], cluster(prov) 

I understand why I should use the cluster option but I'm really struggling with understanding what's happening more formally. 
I would like to write the log likelihood function. However; I do not understand how to incorporate the clusters.
Will the clusters influence the likelihood function?

I guess my question is stupid but I'm really struggling with this and would really appreciate any help I could get.

Best regards 
/Elin Vimefall

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