subsets
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 ?crit :
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. S?ugetiere Martin-Luther-King-Platz 3 D-20146 Hamburg, GERMANY +49(0)40 42838 6231 ivan.calandra at uni-hamburg.de ********** http://www.for771.uni-bonn.de http://webapp5.rrz.uni-hamburg.de/mammals/eng/1525_8_1.php