Astounding wrote: Here's an approach that is quick and easy.  However, note that it will affect missing values for ALL your variables, not just ones that you have in mind such as DATE: When you have variable that you want want to LOCF then bring them in using a SET statement. data have;    input DATE1 $16.;    date2 = date1;    if not missing(date1) then set sashelp.class point=_n_;    output;    call missing(of _all_);    cards; 12 Nov 2013 13 Nov 2013 14 Nov 2013 ;;;;    run; proc print;    run; data middle / view=middle;    set have;    dummy='abc';    run; data want;    update middle(obs=0 keep=dummy) middle(keep=dummy date:);    by dummy;    set have(drop=date:);    output;    drop dummy;    run; proc print;    run; ... View more