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st: Date: Thu, 29 Nov 2007 09:08:18 +0100

From   "Di Stefano, Paola" <>
To   <>
Subject   st: Date: Thu, 29 Nov 2007 09:08:18 +0100
Date   Thu, 29 Nov 2007 03:08:33 -0500 (EST)

Hi everybody,

I have 56 patients with 5 measurements each (y0,y1, y2, y3, y4). I'using
the xtgee command:

xi: xtgee y i.terapy, family(gaussian) link(identity) corr(exchangeable)

The default reference is y0 and so I obtain the comparison between
y1 versus y0
y2 versus y0
y3 versus y0
y4 versus y0.
I would like to know also the comparison between y4 versus y3 (for
How can I change the reference value from y0 to y3 without changing the
Does anybody can help me please?

Thanks a lot,

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