![]() ![]() I’m guessing from this data – and I should probably say “know” instead of “guess” – that some change was made to either the process or the data collection at the missing value. Following point 30 you appear to have good statistical control. After the missing value, you have a few points in a “settling down” period through about point 30 that show high variation and maybe a lack of control initially.ģ. Through the first 24 points, before the missing value, you clearly have an upward trend where values keep getting larger and larger.Ģ. ![]() Whoa there…you’re definitely out of control for the first 1/3-1/2 of the chart! It’s hard to give much practical advice without knowing the process, but from the data alone my observations are:ġ.
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