Sample Size Calculation in Quality Management

[Former Member]

Dear QM Experts,

We are facing an issue in sample size calculation when the Inspection Lot Quantity is less than 1 Kg Lets Say for Ex: 0.5 Kg. We are using MICs inside the Plan with suitable Sampling Procedure. The Sampling Procedure has the Following Settings

Sampling Type = Fixed Sample, Valuation Mode = Attributive inspection for Non-Confirming Units, No of Samples = 2

So Whenever the Inspection Lot Quantity is 1 Kg or More than that then Each of the MICs inside the results recording screen has the "Inspect" Column correctly set to 2. However when the inspection Lot Quantity is set to 0.5 Kg, the "Inspect" Column for that MIC is set to "1".

Kindly Provide your suggestions how to handle this ?. Kindly advise if we can avoid this by changes to Inspection Plan or Sampling Procedure.We would like to have the "Sample Size" or the "No of Inspections" to be carried out on a MIC to be Fixed irrespective of the Inspection Lot Quantity.

Regards

Ram

[Former Member · Accepted solution]

Hi All,

Issue Resolved by Adjusting the Base Unit of Measure against the MICs. SAP Calculates Sample Size by multplying the Sample Size in the Sampling Procedure ( = 2) and the Base Unit of Measure against that MIC (0.5 KG). So SAP Calculates this for each and Every MIC inside that operation and takes the highest number out of that. Therefore the minimum sample Size requirement in the above case was = 0.5 X 2 = 1 KG

If the Inspection Lot is created with a quantity lesser than this then the Inspect Column Showed "1" although the sampling procedure had a sample size of "2". This is because SAP finds that the Inspection Lot quantity and therefore the sample size in the lot is not enough to meet the minimum sample size requirements for that operation. To resolve this issue we modified the Base quantity as 0.1 KG and it resolved our issue

Regards

Ram