![]() ![]() If the subgroup size is over ten (or twelve), then use an X and S chart. ![]() If the subgroup size is from two to ten (or possibly twelve), then use an X and R chart. If the subgroup size is one, then use an Individual measurements chart, with or without a moving R chart. With variable data, decide how large subgroups are. There are only a few (usually two) discrete values. Variable data takes on a measurable, numeric value. First decide what type of data you're dealing with. ![]() Which Control Charts to Use? A common question is "Which control chart should I use?" Although the answer can become deep and complex, here are some simple recommendations. Quality Analyst 651A A common question is "Which control chart should I use?" Although the answer can become deep and complex, here are some simple recommendations. » Print friendly version of this article.ġ out of 2 people have found this article useful. Quality Control and Management > Quality Analyst ![]()
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