Date:         Fri, 28 Dec 2007 14:37:27 -0800
Reply-To:     Patrick <patrick.matter@GMX.CH>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Patrick <patrick.matter@GMX.CH>
Organization: http://groups.google.com
Subject:      Re: counting when condition appears
Comments: To: sas-l@uga.edu
Content-Type: text/plain; charset=ISO-8859-1

And I would also use my chance and add a unique ID for this dataset
(eg: DSID):

data out;
  set in;
  by id;
  DSID=_n_;
  if first.id then flag=0;
  flag+dx;
  run;