topic Re: Selecting max value from multiple observations in SAS Health and Life Sciences

Selecting max value from multiple observations

deleted_user — Wed, 10 Jan 2007 18:20:00 GMT

I have the following variables (id and score) and would like to know how to get the third variable maxscore:
id score maxscore
1 5 7
1 7 7
1 3 7
2 2 8
2 1 8
2 8 8

What is the code that I'll need to use to get maxscore to pick the largest value from the observations for each id?
Thank you for your help!

Re: Selecting max value from multiple observations

deleted_user — Wed, 10 Jan 2007 19:34:12 GMT

> I have the following variables (id and score) and
> would like to know how to get the third variable
> maxscore:
> id score maxscore
> 1 5 7
> 1 7 7
> 1 3 7
> 2 2 8
> 2 1 8
> 2 8 8
>
> What is the code that I'll need to use to get
> maxscore to pick the largest value from the
> observations for each id?
> Thank you for your help!

You can use either a Proc SQL step or a data step to find a solution. SQL may appear concise but it also preprocesses the data to arrive at the max score for each ID. I have presented only the SQL solution below:

data NOmaxscore ;
input id score ;
cards ;
1 5
1 7
1 3
2 2
2 1
2 8
run ;

proc sql ;
create table WITHmaxscore as
select * , max(score) as maxscore
from NOmaxscore
group by id ;
quit ;

options nocenter ;
proc print ;
run ;

And this yields:

Obs id score maxscore

1 1 5 7
2 1 3 7
3 1 7 7
4 2 8 8
5 2 1 8
6 2 2 8

Venky Chakravarthy

Re: Selecting max value from multiple observations

deleted_user — Wed, 10 Jan 2007 20:31:56 GMT

Thank you very much!