Message-ID: <p05200f00bae8001643f9@[128.40.218.142]>
Date: 2003-05-14T14:25:57Z
From: Frank
Subject: building mean/median over subgroups
Dear all,
I'm trying to solve the following problem, and hoping to get some
advise here from the group
I have a dataframe in which the same sample was measured more than
once on the same day. I would reorganize the dataframe to get a
single value (mean /median) for one day
Patient Day Sample Test
A 1 A 23
A 1 A 36
A 5 B 44
A 5 B 23
B 2 C 10
B 2 C 5
mean
Patient Day Sample Test.mean
A 1 A 29.5
A 5 A 33.5
B 2 C 7.5
it would be great to get some help form the list.
Yours
Frank
--
Frank Mattes, MD e-mail: f.mattes at ucl.ac.uk