[R] Getting number of students with zeroes in long format

From: Christopher Desjardins <cddesjardins_at_gmail.com>
Date: Wed, 06 Apr 2011 15:44:17 -0500


Hi,
I have longitudinal school suspension data on students. I would like to figure out how many students (id_r) have no suspensions (sus), i.e. have a code of '0'. My data is in long format and the first 20 records look like the following:

> suslm[1:20,c(1,7)]

   id_r sus
   11 0
   15 10
   16 0
   18 0
   19 0
   19 0
   20 0
   21 0
   21 0
   22 0
   24 0
   24 0
   25 3
   26 0
   26 0
   30 0
   30 0
   31 0
   32 0
   33 0

Each id_r is unique and I'd like to know the number of id_r that have a 0 for sus not the total number of 0. Does that make sense? Thanks!
Chris

        [[alternative HTML version deleted]]



R-help_at_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. Received on Wed 06 Apr 2011 - 20:58:19 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Thu 07 Apr 2011 - 13:20:28 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.

list of date sections of archive