function modle for calculate standard deviation

[srajendran]

hai friends,

i want to calculate standard deviation for the following data. is there any function module for calculating standard deviation? pls let me know.

no. qty.

1 10

2 20

3 50

4 90

5 40

with regards,

senthil kumar.r

[Former Member]

Try these FMs:

QRKT_STD_DEVIATION_SHEWHART

QRKT_STD_DEVIATION_SHEWHART_2

[Former Member]

Check out using these two FM to calculate the standard deviation which is used for the track of a quality control chart, if you want to use the standard deviation as a control value for a quantitative characteristic in order to detect the dispersion changes for a characteristic. The second one uses the multiplicative factor for the chi-square distribution required for the calculation of the control limits is estimated on the basis of the total dispersion of all original values.

1)QRKT_STD_DEVIATION_SHEWHART

2)QRKT_STD_DEVIATION_SHEWHART_2

[srajendran]

HAI Judith Jessie Selvi ,

thanks for your reply. here i want to calculate std deviation for qty. how will you pass the values in this fn. module. can u give my any example.

with regards,

senthil kumar.r

[Former Member]

Hi,

U can refer to the documentation of the function module, i too havent used this FM.

Kindly reward points if u find this as helpful.

[Former Member]

Hi senthil,

1. I don't there is any direct FM/functionality,

for such MATHEMATICAL calculations.

2. INDEPENDENT FORM

3. I have developed one independent

form which will calculate STANDARD DEVIATION.

4. copy paste in new program.

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

regards,

amit m.

[Former Member]

Hi again,

1. To verify the formula and correctness,

(also the example, which i have taken)

2. goto this site.

and see the formula as well as the SAME example

6.32

http://www.med.umkc.edu/tlwbiostats/variability.html

regards,

amit m.

[srajendran]

thanks amit