*---Usage of LAG function;

*---The lag function is a way to retrieve values of a variable from a previous record.

You may retrieve data from the last record or any of the previous 100 records by using

the LAGN(variable) function (i.e., LAG1, LAG2, ..., LAG100).;

data test;

input x;

lag1=lag1(x);

lag2=lag2(x);

lag5=lag5(x);

cards;

1

2

3

4

5

6

7

8

9

10

;

run;

proc print;

title "Example Using LAG Function";

run;

/* SAS Ouput:

Example Using LAG Function

Obs x lag1 lag2 lag5

1 1 . . .

2 2 1 . .

3 3 2 1 .

4 4 3 2 .

5 5 4 3 .

6 6 5 4 1

7 7 6 5 2

8 8 7 6 3

9 9 8 7 4

10 10 9 8 5

*/