What Is An I-MR-R/S (Between/Within) Chart?

Raj Kumar

03/01/2018 0 0

Use an I-MR-R/S chart to monitor the mean of your process. Use this to find the variation between and within subgroups when each subgroup is a different part or batch:

i. I chart: The I chart monitors the process mean. The control limits of the I chart are calculated using the between-subgroup variation, but not the within-subgroup variation.

ii. MR chart: The moving range chart plots a moving range of the subgroup means. Therefore, the MR chart only monitors the between-subgroup component of variation, not the within-subgroup variation.

iii. R chart or S chart: The R or S chart monitors within-subgroup variation.

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