在当前观察中读取下一个观察值 [英] reading next observation's value in current observation

问题描述

我有一个名为输入"的数据集，其中包含以下观察结果

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

身份证工资
10 1000
20 2000
30 3000
40 4000

ID Salary
10 1000
20 2000
30 3000
40 4000

我需要一个具有以下观察结果的输出数据集

I need an output dataset with following observations

ID 工资 Next_row_Salary
10 1000 2000
20 2000 3000
30 3000 4000
40 4000 空

ID Salary Next_row_Salary
10 1000 2000
20 2000 3000
30 3000 4000
40 4000 null

注意:场景是下一个观察的薪水应该是列Next_Row_salary的当前观察值.如果没有下一个观察值，则列 Next_Row_salary 的当前观察值应为空".

Note: The scenario is next obersavtion's salary should be the current observation's value for the column Next_Row_salary. If there is no next observation then the current observation's value for the column Next_Row_salary should be 'null'.

请帮助我为这个场景创建一个 sas 代码.

Kindly help me out in creating a sas code for this scenario.

推荐答案

有几种方法可以实现这一点，以下是我的方法.

There are a few ways to achieve this, here's how I would do it.

data have;
   input ID Salary;
   cards;
10 1000
20 2000
30 3000
40 4000
;
run;

data want;
   recno=_n_+1;
   set have end=last;
   if not last 
           then set have (keep=salary rename=(salary=next_row_salary)) point=recno;
      else call missing(next_row_salary);
run;

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