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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Cumulative-standard-deviation/SAS/cumulative-standard-deviation.sas Normal file
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*--Load the test data;
data test1;
input x @@;
obs=_n_;
datalines;
2 4 4 4 5 5 7 9
;
run;
*--Create a dataset with the cummulative data for each set of data for which the SD should be calculated;
data test2 (drop=i obs);
set test1;
y=x;
do i=1 to n;
set test1 (rename=(obs=setid)) nobs=n point=i;
if obs<=setid then output;
end;
proc sort;
by setid;
run;
*--Calulate the standards deviation (and mean) using PROC MEANS;
proc means data=test2 vardef=n noprint; *--use vardef=n option to calculate the population SD;
by setid;
var y;
output out=stat1 n=n mean=mean std=sd;
run;
*--Output the calculated standard deviations;
proc print data=stat1 noobs;
var n sd /*mean*/;
run;