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

From   Steven Samuels <>
Subject   Re: st: 3 Level - LMM - Number of clusters?
Date   Tue, 24 Jun 2008 21:41:10 -0400

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

This doesn't seem right to m
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.

On Jun 24, 2008, at 12:04 PM, Christian Weiß wrote:


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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