Standard Deviation Between Two Rows

[Khaladdin]

Hi, 

I have a quick question about standard deviation in SAS.

Assume that I have the following dataset:

     Time     Value

     1          25

     2          32

     3          23

     4          26

I want to compute standard deviation of between two rows. It implies that I will have the following dataset:

     Time    Value     Stddev

     1          25          .

     2          32         stddev(25;32)

     3          23         stddev(32;23)

     4          26         stddev(23;26)

Thanks in advance for help!

[Jagadishkatam · Accepted solution]

data have;
input Time Value;
 stddev=std(value,lag(value));
cards;
1 25
2 32
3 23
4 26
;

[Khaladdin]

Many thanks. Works well!