Standard Deviation

[heather473]

I need help figuring out how to input the equation for standard deviation. I'm not allowed to use the one given in my cobol software for my class assignment. thanks

 

[BettyScherber]

What equation was given in your class so we don't give you the same one? Betty Scherber
Brainbench MVP for COBOL II

http://www.brainbench.com

 

[heather473]

I guess there is some software in MicroFocus cobol that automatically does the standard deviation. I'm not supposed to use that. I know the equation is (((x-mean)**2) /N )**.5. I just don't know how to get it into a statement to get it to run. I've tried compute statements for each bracket() individually but that doesn't seem to work. HELP.
Thanks

 

[BettyScherber]

Option 1:
COMPUTE STD-DEV ROUNDED = (((x-mean)**2) / N ) ** .5

Option 2:
MULTIPLY X-MEAN BY X-MEAN GIVING X-MEAN-SQD ROUNDED.
DIVIDE N INTO X-MEAN-SQD GIVING STD-DEV-SQD ROUNDED
COMPUTE STD-DEV ROUNDED = STD-DEV-SQD ** .5.

Both should do exactly the same thing. Choose whichever one you think gets you far enough away from the one you're not supposed to use. Betty Scherber
Brainbench MVP for COBOL II

http://www.brainbench.com