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Is the following statement true?
"Operating Chracteristics Curves use to be included in the full text of the old Mil 105 standard. These should help you answer your question.
Be very careful however, that you don't use too sharp a pencil when dealing with these issues.
The Dodge Romig sampling schemes (from which the standard was derived) are very dependent on several statistical assumptions. Some of these are:
1)Purely random sample selection.
2)Statistical stability of the stream of product being presented for sampling.
3)A continuous, homogeneous, stream of product from one source.
etc., etc. etc.
If any of these conditions cannot be verified, you need to investigate a different approach.
Shewhart told us that only in cases of statistical stability, could the results of sample nspections be extrapolated to those products that weren't inspected or tested. Sampling plans are no different. "
Does anyone out there has the full list of the assumpions behind MIL STD?
Since we are Contract Manufacturing for electronic assemblies, we have lots of manual assembly and many different products. We have different PCB designs with different people placing different components; so much variation!
Will MIL STD plan even work in our set up?
Thanks,
Taha.
"Operating Chracteristics Curves use to be included in the full text of the old Mil 105 standard. These should help you answer your question.
Be very careful however, that you don't use too sharp a pencil when dealing with these issues.
The Dodge Romig sampling schemes (from which the standard was derived) are very dependent on several statistical assumptions. Some of these are:
1)Purely random sample selection.
2)Statistical stability of the stream of product being presented for sampling.
3)A continuous, homogeneous, stream of product from one source.
etc., etc. etc.
If any of these conditions cannot be verified, you need to investigate a different approach.
Shewhart told us that only in cases of statistical stability, could the results of sample nspections be extrapolated to those products that weren't inspected or tested. Sampling plans are no different. "
Does anyone out there has the full list of the assumpions behind MIL STD?
Since we are Contract Manufacturing for electronic assemblies, we have lots of manual assembly and many different products. We have different PCB designs with different people placing different components; so much variation!
Will MIL STD plan even work in our set up?
Thanks,
Taha.