'Matrix' Doug Bates mentioned (and wrote!).
Martin Maechler
HaroldD> -Original Message-
HaroldD> From: Bert Gunter [mailto:[EMAIL PROTECTED]
HaroldD> Sent: Mon 7/21/2008 6:45 PM
HaroldD> To: Doran, Harold; [EMAIL PROTECTED]; r-help@r-project.org
H
Hello,
I'm trying to run a regression predicting trade flows between importers and
exporters. I wish to include both year-importer dummies and year-exporter
dummies. The former includes 1378 levels, and the latter includes 1390
levels. I have roughly 100,000 total observations.
When I'm using
PM
To: Doran, Harold; [EMAIL PROTECTED]; r-help@r-project.org
Subject: RE: [R] Large number of dummy variables
Unless I'm way off base, dummy variable are never needed (nor are desirable)
in R; they should be modelled as factors instead. AN INTRO TO R might, and
certainly V&R's M
onday, July 21, 2008 3:16 PM
> To: [EMAIL PROTECTED]; r-help@r-project.org
> Cc: Douglas Bates
> Subject: Re: [R] Large number of dummy variables
>
> Well, at the risk of entering a debate I really don't have time for (I'm
> doing it anyway) why not consider a random coeffici
-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Doran, Harold
Sent: Monday, July 21, 2008 3:16 PM
To: [EMAIL PROTECTED]; r-help@r-project.org
Cc: Douglas Bates
Subject: Re: [R] Large number of dummy variables
Well, at the risk of entering a debate I really don't have time for (I
ROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Alan Spearot
> Sent: Monday, July 21, 2008 5:59 PM
> To: r-help@r-project.org
> Subject: [R] Large number of dummy variables
>
> Hello,
>
> I'm trying to run a regression predicting trade flows between
> importers
Hello,
I'm trying to run a regression predicting trade flows between importers and
exporters. I wish to include both year-importer dummies and year-exporter
dummies. The former includes 1378 levels, and the latter includes 1390
levels. I have roughly 100,000 total observations.
When I'm using
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