reading next observation's value in current observation

Question

I\'ve a dataset called \'input\' with the following observations

ID Salary
10 1000
20 2000
30 3000
40 4000

I need an output dataset with

Answer 1

There's no direct way to do this in a data step. There's two approaches you can use:

Option 1: Sort in reverse, use the lag function

proc sort data=your_dataset;
 by descending id;
run;

data your_dataset;
 set your_dataset;
 next_row_salary = lag(salary);
run;

proc sort; by id; run;

Options 2: Use proc expand

proc expand data=your_dataset method=none;
 by id;
 convert salary = next_row_salary / transformout=(lead 1);
run;