Re: st: 3 Level - LMM - Number of clusters?

[Steven Samuels <sjhsamuels@earthlink.net>]

Do you mean:
A
1. countries are nested within industries
2. firms are nested within countries?

This doesn't seem right to m
Or
B
1. industries are nested within countries
2. firms are nested within industries.

In fact, neither A nor B seems right to me, as SIC codes are not  
unique to countries nor countries to SIC codes.


Please clarify the structure of your problem.

-Steve
On Jun 24, 2008, at 12:04 PM, Christian Wei� wrote:


> Hello!
>
>  I am currently trying to bugfix a linear mix model. My sample  
> comprises about 2000 observations (firms) which are nested as follows:
>
> Level  1:  nested in 9 industries (1 Digit SIC Code) or(!)  68  
> industries (2 digit SIC code)
> Level 2:   nested in  11 countries
>
> Most of the modeled effects will be random.
>
> Is it possible, that the number of industries /  countries causes  
> my model not to converge? (I somehow recall having read that about  
> 20 clusters should be used?)
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