Hi!
I think you should read the intro to R, as well as ?"[" and ?subset. It
should help you to understand.
Let's say your data is in a data.frame called df:
# 1. ah and ihd
df_ah_ihd <- df[df$diagnosis=="ah" | df$diagnosis=="ihd", ] ## the "|"
is the boolean OR (you want one OR the other). Note the last comma
#2. ah
df_ah <- df[df$diagnosis=="ah", ]
#3. ihd
df_ihd <- df[df$diagnosis=="ihd", ]
You could do the same using subset() if you feel better with this function.
HTH,
Ivan
Le 1/20/2011 09:53, Den a écrit :
Dear R people
Could you please help.
Basically, there are two variables in my data set. Each patient ('id')
may have one or more diseases ('diagnosis'). It looks like
id diagnosis
1 ah
2 ah
2 ihd
2 im
3 ah
3 stroke
4 ah
4 ihd
4 angina
5 ihd
..............
Q: How to make three data sets:
1. Patients with ah and ihd
2. Patients with ah but no ihd
3. Patients with ihd but no ah?
If you have any ideas could just guide what should I look for. Is a
subset or aggregate, or loops, or something else??? I am a bit lost. (F1
F1 F1 !!!:)
Thank you
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--
Ivan CALANDRA
PhD Student
University of Hamburg
Biozentrum Grindel und Zoologisches Museum
Abt. Säugetiere
Martin-Luther-King-Platz 3
D-20146 Hamburg, GERMANY
+49(0)40 42838 6231
ivan.calan...@uni-hamburg.de
**********
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http://webapp5.rrz.uni-hamburg.de/mammals/eng/1525_8_1.php
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and provide commented, minimal, self-contained, reproducible code.
