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hi,everyone ,who could show me the correlation of process variation and total variation ,and what's the definition of process variation thank you
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hi,everyone ,who could show me the correlation of process variation and total variation ,and what's the definition of process variation thank you
hi,everyone ,who could show me the correlation of process variation and total variation ,and what's the definition of process variation thank you
fisrt of all ,i getta say thanks to you all moderators for your replies ,your answers has kind of enlightened me .
yeah, that's what got me confused ,i don't know the exact formula for Total variation , so is the total variation equal to the sum of the three items ,and what does the dots behind mean? is there any more items shall be added to the previous ones ?
and from your words i feel may be in some situation the part variation is not equal to process variation ....right ,so that's the key problem casting me into confusion ......
is that all that i should concern ,i mean the total variation = deviation from process +deviation from measurement system ? and the process variation ideally equals part variation (sometimes at least we should consider the effects from ambience right ?) and the measurement system consists of only two parts : repeatability and reproducibility ?
i appreciate very much ..........
hi miner ,today i get the formula in MSA handbookTV= process variation/6 (page 116 of MSA manual)as you've listed a formua quoting : [StdDev(total variation)]^2 = [StdDev(process variation)]^2 + [StdDev(repeatability)]^2 + [StdDev(reproducibility)]^2 + ...
so don't you think these two are kind of contradictory of each other
i am new in this field , and easy to get confused ...... thank you