Did you load the package in R? Sounds like you didn't. Try

require(nlme)

Another possibility is that that function is hidden. Just to be sure, are you should be using it like this

summary(mod)

Not like this

summary.lme(mod)

HTH

Gavin

Sent from my HTC

----- Reply message -----
From: "Joanna Geller" <joanna.d.geller@gmail.com>
Date: Wed, Nov 17, 2010 21:39
Subject: [R] Problem with nlme package
To: <r-help@r-project.org>

Hello,

I have installed the nlme package, but every time I try to use the
function "summary.lme," I get a message that the function cannot be
found. I've tried to install the package several times and have
re-started R several times, but to no avail. I have also loaded the
lme4 package, in case that makes a difference. I'm using R on a brand
new Mac.

Thank you!

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