Re: Relationship between Process Variation and Total Variation
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 ..........