should work with soething like:

data a b; set xxx; if not mod(_n_,5) then output b; else output a; run;

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> -----Urspr> üngliche Nachricht----- > Von: O J Nwoha [SMTP:nwohaj@SPECTRE.AG.UIUC.EDU] > Gesendet am: Dienstag, 18. April 2000 20:15 > An: SAS-L@LISTSERV.UGA.EDU > Betreff: Dividing Dataset Into Two > > SAS Experts: > > I have a dataset of 13608 observations and I want to break it into two > datasets as follows: > > Dataset A has 80 percent of the observations. > Dataset B has 20 percent of the observations, but I need it to contain > every fifth observation from the entire data set. Observations in A > should not be in B. > > How can I do this? > > Thanks in advance for your help. > > Ogbonnaya John Nwoha > http://www.ag.uiuc.edu/~nwohaj/ > > > Research Assistant, AgMas & FARM.DOC Projects > http://web.aces.uiuc.edu/farm.doc/