Dear List, I ran into some problems with time-series-Data.
Imagine a data-structure where observations (x) of test attendants (i) are made a four times (q) a year (y). The data is orderd the following way: I y q x 1 2006 1 1 1 2006 3 1 1 2006 4 1 1 2007 1 1 1 2007 2 1 1 2007 3 1 1 2007 4 1 2 2006 1 1 3 2007 1 1 3 2007 2 1 I am looking for a way to count the attendants that at least have attendend one time a year. In this case 2 persons, because i=2 has no observation in 2007. I thought about creating a subset with the duplicate function. But I can't find a way to control (i) and (y). subset(data, !duplicated(i[y])) Thanx so much Andreas Kunzler ____________________________ Bundeszahnärztekammer (BZÄK) Chausseestraße 13 10115 Berlin Tel.: 030 40005-113 Fax: 030 40005-119 E-Mail: [EMAIL PROTECTED] ______________________________________________ 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.
