Lag Function

[aidant01]

Hi everyone, 

I'm getting:

var1	var2	var3
A	1/1/14
A	1/2/14	1/1/14
A	1/3/14	1/2/14
A	1/4/14	1/3/14
A	1/5/14	1/4/14
A	1/6/14	1/5/14
A	1/7/14	1/6/14
A	1/8/14	1/7/14
A	1/9/14	1/8/14
A	1/10/14	1/9/14
A	1/11/14	1/10/14
A	1/12/14	1/11/14

I want:

var1	var2	var3
A	1/1/14	1/2/14
A	1/2/14	1/3/14
A	1/3/14	1/4/14
A	1/4/14	1/5/14
A	1/5/14	1/6/14
A	1/6/14	1/7/14
A	1/7/14	1/8/14
A	1/8/14	1/9/14
A	1/9/14	1/10/14
A	1/10/14	1/11/14
A	1/11/14	1/12/14
A	1/12/14

I'm using the following code:

data datawant;

set dataraw;

var3=lag(var2);

run;

Thanks!!!

[PeterClemmensen]

What you want here is not a lag. It is a lead (look ahead). Due to the construction of the data step processing, it does not support a lead function. However, you can do a workaround like this

data have;
input var1 $ var2:mmddyy10.;
format var2 mmddyy10.;
datalines;
A 1/1/14 
A 1/2/14
A 1/3/14
A 1/4/14
A 1/5/14
A 1/6/14
A 1/7/14
A 1/8/14
A 1/9/14
A 1/10/14
A 1/11/14
A 1/12/14
;

data want;
   merge have have(firstobs=2 keep=var2 rename=(var2=var3));
run;