Ashta wrote:
Hi Bill and all,
On Tue, Oct 20, 2009 at 12:09 PM, William Dunlap <wdun...@tibco.com> wrote:
From: r-help-boun...@r-project.org
[mailto:r-help-boun...@r-project.org] On Behalf Of Peter Ehlers
Sent: Tuesday, October 20, 2009 8:48 AM
To: Ashta
Cc: R help
Subject: Re: [R] Counting
How about
unch <- aggregate(x2==x1, by = list(x1=x1), FUN = sum)
chgd <- aggregate(x2!=x1, by = list(x1=x1), FUN = sum)
-Peter Ehlers
When I hear 'count' I think first of the table() function.
E.g.,
> d<-data.frame(x1=c(1,1,0,0,0,1,0), x2=c(1,0,1,1,0,1,1))
> with(d, table(x1, x1==x2))
x1 FALSE TRUE
0 3 1
1 1 2
or
> with(d, table(x1, factor(x1==x2,labels=c("Changed","Unchanged"))))
x1 Changed Unchanged
0 3 1
1 1 2
or use dimnames<- to change the labels on the table itself.
This works very well for numeric.
How about if the factors are character such as F and M (male and female) ?
Did you try it? Works fine for me.
-Peter Ehlers
Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com
Ashta wrote:
Hi All,
Assume that I have the following data set with two variables and I
want count the number of observation with identical values
and number
of time each factor changed from x1 to x2.
x1 x2
1 1
1 0
0 1
0 1
0 0
1 1
0 1
The output should be
x1 changed
0 3 # has changed 3 times
1 1 # has changed 1 time
x1 unchanged
0 1 # has unchanged only 1 time
1 2 # has unchanged 2 times
Can someone help me how to do it in R?
Thanks in advance
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______________________________________________
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PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
