Hi,
Please can someone explain with a simple dataset merge and proc sql example the difference between following scenarios:
1. if a
2. if b
3. if a and not b
4. if not a and b
Thanks
These are simple logical conditions, whether it's a DATA step, SQL, or a treatise by Aristotle.
Assuming that "a" and "b" can be either true or false:
if a ==> true whenever "a" is true, regardless of the value of "b"
if b ==> true whenever "b" is true, regardless of the value of "a"
if a and not b ==> true whenever "a" is true and "b" is false
if not a and b ==> true whenever "a" is false and "b" is true
In SAS programming, if "a" and "b" represent numeric amounts rather than comparisons, SAS considers 0 and missing to be false and any other value to be true.
Good luck.
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