Many Thanks!
Dimitris Rizopoulos wrote:
Hi Christian,
may be this is helpful:
dat <- data.frame(id=rep(1:4, each=5), smonth=sample(1:5, 20, TRUE)) dat$duplicated <- unlist(tapply(dat$smonth, dat$id, duplicated)) dat
Best, Dimitris
---- Dimitris Rizopoulos Ph.D. Student Biostatistical Centre School of Public Health Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/16/396887 Fax: +32/16/337015 Web: http://www.med.kuleuven.ac.be/biostat/ http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm
----- Original Message ----- From: "Christian Schulz" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, November 10, 2004 1:52 PM Subject: [R] "conditional duplicates"?
Hi,
i would like check a repeated measurement dataset, whether
cases (which (id) could be more than one time included and not all same times included.)
have more than one times the same SMONTH!?
#This pseudo code didn't work with a for loop, because the [i+1] isn't known.
How i could refer to [i+1] ?
if(ID[i] == ID[i+1] & SMONTH[i] !=[i+1]) {res[i] <- 0 } if(ID[i] == ID[i+1] & SMONTH[i] == [i+1]) {res[i] <- 1 }
many thanks, christian
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______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
