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Re: st: Interaction terms

From   Nick Winter <>
Subject   Re: st: Interaction terms
Date   Tue, 03 May 2011 11:02:27 -0400

I believe Arthur Goldberger coined the term micronumerosity (1991, 248-51), available through Google Books:

Goldberger, Arthur S. 1991. A Course in Econometrics. Cambridge: Harvard University Press.

Nick Winter

On 5/3/2011 9:59 AM, Maarten buis wrote:

There is no such thing as a (multi-)collinearity problem(*).


(*) For that reason Gujarati (1995, chapter 10) called the multi-colinearity
problem the "micro-numerosity" problem: correlation among explanatory
variables costs statistical power to the point that we just don't have enough
observations to find what we set out to find. We cannot change the
correlation among explanatory variables, so the only thing we can do
is to gather more data, i.e. the problem is not the correlations but the
too small dataset, hence micro-numerosity (Sorry, a joke tend to loose its
edge when you explain it).

Damodar N. Gujarati (1995) Basic Econometrics, third edition. McGraw-Hill.

Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen

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Nicholas Winter                                 434.924.6994 t
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