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ANCOVA
2 messages · Samuel Okoye, Greg Snow
ANCOVA usually is used when you have a numerical covariate that you want to adjust for, your description does not include any, so a regular anova (aov function) can be used. If you do have 1 or more covariates to adjust for, then it can be thought of as a regression problem (ANCOVA is a special case of linear models/regression) and you can fit it using either the aov or lm function. -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare greg.snow at imail.org 801.408.8111
-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
project.org] On Behalf Of Samuel Okoye
Sent: Tuesday, December 09, 2008 2:03 AM
To: r-help at stat.math.ethz.ch
Subject: [R] ANCOVA
Hello,
Could you please help me in the following question:
I have 16 persons 6 take 0.5 mg, 6 take 0.75 mg and 4 take placebo! Can
I use the ANCOVA and t-test in this case? Is it possible in R?
Thank you in advance,
Samuel
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