Statalist


[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

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


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

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?)


*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



© Copyright 1996–2024 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index