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Taking several samples to form one datapoint, called sample subgrouping, strongly affects the precision and predictive power of your measurement system. You might be tempted to reduce sampling frequency when using larger subgroups, but that relationship is not so simple.
Subgrouping choices as based on many factors, like cost, ease of analysis, process setup and quality of measurement. You could get away with a slightly lower sampling frequency, but that should not be the reason why you use subgroups, and most likely you won't want to reduce sampling frequency...
#continuousimprovement #sampling #spc