topic Re: MIN function not working in SAS Programming

MIN function not working

Kalai2008 — Mon, 31 Jul 2017 19:32:28 GMT

I use max function in Proc SQL its working fine.
MIN function not working properly giving wrong results. Some of them giving me 0 instead of values.

example:

min(case when region = 'SOU' then amt else 0 end) as MIN_sou,
min(case when region = 'NOR' then amt else 0 end) as MIN_nor
,

Re: MIN function not working

PaigeMiller — Mon, 31 Jul 2017 19:36:36 GMT

It could be that 0 is exactly what you asked for with your code (although it may not be what you wanted to get).

But ... we don't know what's in your data, and we don't really know what you want to get as a result ... so could you please show us a representative portion of your data, and explain exactly what result you want to get?

Re: MIN function not working

Tom — Mon, 31 Jul 2017 19:49:29 GMT

It is just doing what you asked.

Consider this two observation dataset.

data have ;
  input regsion $ amt ;
cards;
SOU 100
NOR 150
;

The first CASE will return 0 for the second row and the second CASE will return 0 for the first row.

You should use missing value instead of 0 when the region does not match the target minimum.

,min(case when region = 'SOU' then amt else . end) as MIN_sou
,min(case when region = 'NOR' then amt else . end) as MIN_nor

You probably should have done the same for your MAX() calculations, but perhaps you didn't have any regions where the actual maximum amount was negative you didn't notice it wasn't working.

Re: MIN function not working

Kalai2008 — Mon, 31 Jul 2017 20:14:37 GMT

Thank you for the reply!..

Here is my data look like:

acct date region amt
1 5/21 sou 20
1 5/21 nor 21
1 6/22 sou 30
1 6/22 sou 50

2 5/21 nor 15

Output want:

min_sou min_nor
20 21

Re: MIN function not working

Reeza — Mon, 31 Jul 2017 20:25:49 GMT

I think @Tom hit the nail on the head, if you set it to 0 if missing, that will always be the minimum. Set it to missing instead.

Re: MIN function not working

Kalai2008 — Mon, 31 Jul 2017 20:36:17 GMT

Thank you..It worked!