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Consider a quality characteristic with a target of 100.00 μm and upper and lower specification limits of 106.00 μm and 94.00 μm, respectively. If, after carefully monitoring the process for a while, it appears that the process is out of control and producing output unpredictably (as depicted in the run chart below), one can't meaningfully estimate its mean and standard deviation.
Values near or below zero indicate processes operating off target (^ far from T) or with high variation. Fixing values for minimum "acceptable" process capability targets is a matter of personal opinion, and what consensus exists varies by industry, facility, and the process under consideration.
The input of a process usually has at least one or more measurable characteristics that are used to specify outputs. These can be analyzed statistically; where the output data shows a normal distribution the process can be described by the process mean (average) and the standard deviation.
One part per billion (ppb) denotes one part per 1,000,000,000 (10 9) parts, and a value of 10 −9. This is equivalent to about three seconds out of a century. One part per trillion (ppt) denotes one part per 1,000,000,000,000 (10 12) parts, and a value of 10 −12. This is equivalent to about thirty seconds out of every million years.
The positive predictive value (PPV), or precision, is defined as = + = where a "true positive" is the event that the test makes a positive prediction, and the subject has a positive result under the gold standard, and a "false positive" is the event that the test makes a positive prediction, and the subject has a negative result under the gold standard.
When trading stocks and other securities, it can be helpful to use technical indicators to assess volatility. Average true range, or ATR, is one such indicator that’s often used to track ...
An Associated Press reporter is apologizing after a gaffe on Sunday's Grammys red carpet.. Leslie Ambriz, alongside Krysta Fauria, greeted Kenneth "Babyface" Edmonds during AP's live red carpet ...
PPK (trance duo), a Russian trance duo.ppk, PuTTY private key file format; Walther PPK, a variant of the Walther PP pistol; Pedro Pablo Kuczynski (born 1938), also known as PPK, former President of Peru; Personal preference kit, an allowance of personal items that an astronaut can bring on a mission