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Can anyone give me the formula for calculating Monthly Standard Deviation field on Safety Stock Journal please?
Thanks in advance
You can check the following method:
This method is calculating the standard deviation per month and populating StdDeviationIssueMonth field on Safety stock journal.
Please have a look and let me know if you have further queries.
Is it the same with this following formula?
That's the formula for Standard deviation. I don't think that's the same calculation AX performs on the standard deviation per month field.
What I have found is the following:
1) Obtain Average issues per month (Sum all inventory issues of the selected time horizon
and divide by the number of months of the selected time horizon).
2) Sum all inventory issues for every month of the selected time horizon. You will do this
12 times if your Time horizon is 1 year, for example.
3) Substract the total inventory issues for the first month from the Average issues per
month. Then raise to the square. Repeat for the rest of the total inventory issues for the
4) Sum the squares you obtained in the last step and divide by the number of months
in your time horizon.
5) Get square root of the number you obtaind in the last step.
Hope this helps you.
AX calculates the same way as mentioned in this example.
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