Standard deviation in abap

Dear Freinds,
I want to calculate standard deviation of my internal table columns in abap code , please help me how to calculate it .
Thanks,
Naveen

hi,
try this code for calculating it:-
REPORT abc.
DATA : BEGIN OF itab OCCURS 0,
num TYPE i,
END OF itab.
data : std type p decimals 2.
itab-num = 8. APPEND itab.
itab-num = 25. APPEND itab.
itab-num = 7. APPEND itab.
itab-num = 5. APPEND itab.
itab-num = 8. APPEND itab.
itab-num = 3. APPEND itab.
itab-num = 10. APPEND itab.
itab-num = 12. APPEND itab.
itab-num = 9. APPEND itab.
PERFORM stdev changing std..
write :/ std.
FORM stdev CHANGING std.
DATA : mn TYPE p DECIMALS 2.
DATA : sm TYPE i.
DATA : sm2 TYPE i.
DATA : dev TYPE p DECIMALS 2.
DATA : cnt TYPE i.
LOOP AT itab.
sm = sm + itab-num.
cnt = cnt + 1.
sm2 = sm2 + ( itab-num * itab-num ).
ENDLOOP.
mn = sm / cnt.
dev = ( sm2 - ( ( ( sm * sm ) / cnt ) ) ) / ( cnt - 1 ) .
dev = SQRT( dev ).
std = dev.
ENDFORM. "stdev
Edited by: ricx .s on May 2, 2009 1:50 PM
Edited by: ricx .s on May 2, 2009 1:51 PM

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altenbach wrote:
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Standard deviation in abap

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