Is there a SAS function to delete negative and missing values from a variable in a dataset? - sas

Question

Variable name is PRC. This is what I have so far. First block to delete negative values. Second block is to delete missing values.
data work.crspselected;
set work.crspraw;
where crspyear=2016;
if (PRC < 0)
then delete;
where ticker = 'SKYW';
run;
data work.crspselected;
set work.crspraw;
where ticker = 'SKYW';
where crspyear=2016;
where=(PRC ne .) ;
run;

Answer 1

Instead of using a function to remove negative and missing values, it can be done more simply when inputting or outputting the data. It can also be done with only one data step:
data work.crspselected;
set work.crspraw(where = (PRC >= 0 & PRC ^= .)); * delete values that are negative and missing;
where crspyear = 2016;
where ticker = 'SKYW';
run;
The section that does it is:
(where = (PRC >= 0 & PRC ^= .))
Which can be done for either the input dataset (work.crspraw) or the output dataset (work.crspselected).
If you must use a function, then the function missing() includes only missing values as per this answer. Hence ^missing() would do the opposite and include only non-missing values. There is not a function for non-negative values. But I think it's easier and quicker to do both together simultaneously without a function.

Answer 2

You don't need more than your first test to remove negative and missing values. SAS treats all 28 missing values (., ._, .A ... .Z) as less than any actual number.