Thread: Random Sampling for in-process inspection

Quote: Originally Posted by Tony C It is highly unlikely that random sampling would be more valuable on in-process inspection unless at fixed time intervals. If the sampling is at fixed intervals, it's not random. Quote: Originally Posted by Tony C I like to sample at fixed time intervals based on stability of the process and production rate. This also means that if I have an out of specification result I will need to quarantine a set...

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Quote: Originally Posted by bobdoering The only time you really might want to use random sampling is in a bulk process, where you are trying to evaluate the whole lot based on a sample. For linear processes, I never recommend using random sampling. It masks valuable time sensitive trends. the correct answer to every question is "it depends". Random sampling is used for incoming or final inspection where the product has been...

Quote: Originally Posted by aproddutoor Is it OK to use Systematic Sampling for in-process inspection because after the 1st random part is chosen, it will collect data after a specified number of parts. The only time you really might want to use random sampling is in a bulk process, where you are trying to evaluate the whole lot based on a sample. For linear processes, I never recommend using random sampling. It masks valuable time sensitive...