topic Re: if then else statement with three conditions in SAS Programming

if then else statement with three conditions

Saba1 — Thu, 09 Aug 2018 22:37:37 GMT

I want to create a variable by using "if then else" statement and specify three conditions about the variables in my dataset. I want that "new" variable must be equal to "1" only when all three specified conditions are met and if any one of the conditions is missing, it must be equal to "0".

For example, my code is:

data want;
set have;
if a>0 AND b='buy' AND c<0 then new=1;
else if a<0 AND b='sell' AND c>0 then new=1;
else new=0;
run;

The resulting "new" variable is equal to "1" when all three conditions are met. But it is also equal to "1" when first variable i.e. "a" is having a missing value in the data, and in this case only last two conditions (i.e. variable b and c) are considered. Whereas, I want new=1 only when all three conditions are met.

Kindly guide me where am I doing the mistake.

Thanks.

Re: if then else statement with three conditions

ballardw — Thu, 09 Aug 2018 22:46:56 GMT

Missing is always considered "less than" any thing. Try using

else if . < a <0 AND b='sell' AND c>0 then new=1;

Re: if then else statement with three conditions

Saba1 — Fri, 10 Aug 2018 00:22:31 GMT

I am doing the following and it seems working:

data want;
set have;
if .<a>0 AND b='buy' AND c<0 then new=1;
else if .<a<0 AND b='sell' AND c>0 then new=1;
else new=0;
run;

Thanks.