Hi, All
Forgive me if this is a stupid newbie question. I'm having no luck
googling an answer to this, probably because I don't know the right R
terminology to frame my question. I want to know how to run an R
function on each combination of the values of 2 or more variables. In
SAS-speak this is multiple "BY variables" or "CLASS variables".
In R I've figured out how to do what I want with one by value.
by(mf,mf$centre,summary)
Centre is one of the columns in the data frame "mf" which looks like
this:
names(mf)
[1] "centre" "complex" "appl" "pool" "month" "alloc_gb"
I'd like to analyze, for example, by complex within centre. This has a
manageable number of combinations:
table(mf$centre,mf$complex)
A B C D E F G H
I J K L
B 0 0 0 0 0 0 0 0 0
0 0 60574 0
G 44 209 0 94613 0 156 0 2541 0
748 0 0 215511
O 0 0 0 0 0 0 3446 0 676
0 84400 0 0
Q 0 0 298 0 66277 0 0 0 0
0 0 0 0
In SAS what I'm after is something like:
Proc summary nway;
class centre complex;
var alloc_gb;
output out=s sum=;
run;
How do I get something similar in R?
Jim Lane
Capacity Planner
RBC Financial Group
315 Front St W
6th Floor - H14
Toronto, Ontario CANADA
M5V 3A4
416-348-6024
Display of superior knowledge is as great a vulgarity
as display of superior wealth - greater indeed, inasmuch
as knowledge should tend more definitely than wealth
towards discretion and good manners.
- H. W. Fowler, Modern English Usage
_______________________________________________________________________
This e-mail may be privileged and/or confidential, and the sender does not
waive any related rights and obligations.
Any distribution, use or copying of this e-mail or the information it contains
by other than an intended recipient is unauthorized.
If you received this e-mail in error, please advise me (by return e-mail or
otherwise) immediately.
Ce courrier électronique est confidentiel et protégé. L'expéditeur ne renonce
pas aux droits et obligations qui s'y rapportent.
Toute diffusion, utilisation ou copie de ce message ou des renseignements qu'il
contient par une personne autre que le (les) destinataire(s) désigné(s) est
interdite.
Si vous recevez ce courrier électronique par erreur, veuillez m'en aviser
immédiatement, par retour de courrier électronique ou par un autre moyen.
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
