basic inquiry: "select if"

To:	s-news@lists.biostat.wustl.edu
Subject:	basic inquiry: "select if"
From:	Emil Coman <emilcoman@yahoo.com>
Date:	Mon, 22 May 2006 09:16:00 -0700 (PDT)
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this is my first question posted here, and I'm a beginner with S-Plus, so bear with me...

I am trying to run some analyses, any, say a
lm(Y~ X+ Z)
or

gee(formula = (formula = Y~ X+ Z), cluster = W, variance = "glm.scale")

but only for a sub-group of my dataset, say for males only; I know in SPSS there is a command "select if (gender=1)" e.g., but does anyone know the S-Plus similar command? thanks a lot,

Emil Coman, Statistician 
Institute for Community Research
2 Hartford Square West, Suite 100
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Tel: 860-278-2044, ext.
 257
www.incommunityresearch.org
Fax: 1-860-278-2141
http://sp.uconn.edu/~enc01003

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