Thanks a lot. Is count command in package COUNT? I'm having a hard fine to fine this package.
Thanks again:)
 
Best,Farnoosh Sheikhi


________________________________


Cc: R help <r-help@r-project.org> 
Sent: Tuesday, October 23, 2012 2:07 PM
Subject: Re: [R] frequency

Hi,
Try this:
dat1<-read.table(text="
ID    Visit
x a1
x a2
x a2
x a1
x a1
y b1
y c23
y b33
",sep="",header=TRUE,stringsAsFactors=FALSE) 
cn1<-count(dat1[!duplicated(dat1),]$ID)
colnames(cn1)<-c("ID","response")
merge(dat1,cn1,by="ID",all=TRUE)
#ID Visit response
#1  x    a1        2
#2  x    a2        2
#3  x    a2        2
#4  x    a1        2
#5  x    a1        2
#6  y    b1        3
#7  y   c23        3
#8  y   b33        3
A.K.






________________________________


Sent: Tuesday, October 23, 2012 4:55 PM
Subject: Re: [R] frequency


Hi there,

Thanks a lot for getting back to me. If the data has repeated visit as follow, does the code change? Therefore the response would be 2 not 3. How can I consider this problem in my code?
ID    Visit
x       a1
x      a2
xa1
y      b1
y     c23
y     b33


Thanks a lot.
Best,Farnoosh Sheikhi


________________________________


Cc: R help <r-help@r-project.org> 
Sent: Tuesday, October 23, 2012 1:33 PM
Subject: Re: [R] frequency

Hi,
Assuming that there are two columns in your data.
dat1<-read.table(text="
ID    Visit
x a1
x a2
y b1
y c23
y b33
",sep="",header=TRUE,stringsAsFactors=FALSE) 

cnt<-count(dat1$ID)
colnames(cnt)<-c("ID","response")
merge(dat1,cnt,by="ID",all=TRUE)
#  ID Visit response
#1  x    a1        2
#2  x    a2        2
#3  y    b1        3
#4  y   c23        3
#5  y   b33        3


But, if there is only column and you want to split
it
ID<-c("xa1","xa2","yb1","yc23","yb33")
ID1<-gsub("(.*)a.*|b.*|c.*","\\1",ID)
 visit<-gsub(".*(a.*|b.*|c.*)","\\1",ID)
 dat2<-data.frame(ID1,visit)
dat2[]<-lapply(dat2,as.character)

 cnt<-count(dat2$ID1)
colnames(cnt)<-c("ID1","response")
 merge(dat2,cnt,by="ID1",all=TRUE)
#  ID1 visit response
#1   x    a1        2
#2   x    a2        2
#3   y    b1        3
#4   y   c23        3
#5   y   b33        3


A.K.



----- Original Message -----

To: "r-help@R-project.org" <r-help@r-project.org>
Cc: 
Sent: Tuesday, October 23, 2012 3:14 PM
Subject: [R] frequency

Hello,

I have a data as follow:
ID    Visit
xa1
xa2
yb1
yc23
yb33

I want to look at frequency of visit for ID and create a new column as response . 
For example my response would be 2 for x and 3 for y.
I think I need to write a loop, but I don't know how.
I really appreciate your help.
Thanks a lot.
Best,Farnoosh Sheikhi
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