From: Mike Anas on
Does anyone know how to use PROC EXPAND without it dropping an
observation when there is only 1 "usable input observation" per by
group?

I'm using PROC EXPAND to lag fields and want it to function similar to
a left join.

Thanks.
From: GuyA on
I don't currently have PROC EXPAND available, but I've used it in the
past. I don't miss it really: I don't think there is anything that its
lagging capabilities can do that can't be done fairly easily with the
lag functions (lag1 - lag100) in the data step.

I think the only thing that PROC EXPAND can do that no other single
step process can do is return forward looking results.