Moud, Kamyar wrote: > Hi All > > Can we have an incremental counter in SAS like "for loop" in VB for > certain observations of a variable (not the whole column)? Where can > I find quick simple example of it? Sample below). Thx >

Unlike VB, a data step has an implicit loop. The automatic variable _n_ tells you which iteration the implicit loops is in. When the implicit loop contains a SET statement, _n_ corresponds to the row number of the data set. { There are cases when the previous statement is not true, but those are cases you probably don't have to worry about right now }.

> for certain observations of a variable

Depending on the criteria, you might have

if _n_ in (6,10,12) then myCounter + 1; if _n_ > 16 then myCounter = .;

What is your definition of "certain" ?

-- Richard A. DeVenezia http://www.devenezia.com/