![]() ![]() Xbar&R charts are for those processes where when you take information from a sub group of items there is more opportunity for them to have differences in the measurements and therefore give you a range. However, taking samples in different time chunks may show differences and therefore the “range” is then determined by subtracting the previous sample from the current sample. Keep in mind that I&MR charts are for homogenous data such as sampling from a waste water influent tank, paint vat, gases etc., meaning if you were to take five samples from something like this there probably wouldn’t be much difference in the range and it would be very similar to having taken just one sample.
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