Answer Posted / naveen

this Question was raised by saddi soorath....

lag function enables you to have the previous value.

we have the following data
Name num
Naveen 1
Naveen 2
Basha 1
Basha 2

so in data step
if u give num1 =lag(num) you will have the following result

Name num num1
Naveen 1 .
Naveen 2 1
Basha 1 .
Basha 2 1

Thanks and regards

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