Message-ID: <B0F504209244B14EA9A4C1DFB599B9224FFDCB@NIHCESMLBX6.nih.gov>
Date: 2006-12-18T05:15:59Z
From: Cressoni, Massimo (NIH/NHLBI) [F]
Subject: proc GLM with R
I want to migrate from SAS to R.
I used proc mixed to do comparison between multiple groups and to perform
multiple comparison between groups since, as far as I know, proc mixed does not make assumptions about the data and so
it is better than a simple anova (data must only be normal).
Es. how can I translate a code like this (two way anova with a factor of
repetition) :
proc mixed;
class kind PEEP codice;
model PaO2_FiO2 = kind PEEP kind*PEEP;
repeated /type = un sub=codice;
lsmeans kind*PEEP /adjust=bon;
run;
codice is a unique identifier of patient
kind is a variable which subdivided the patient (i.e. red or brown hairs)
PEEP is positive end expiratory pressure. These are the steps of a clinical
trial. Patient did the trial at PEEP = 5 and PEEP = 10
Thank you
Massimo Cressoni
run;