The phrase "a control limit of" is correct and usable in written English.
It is typically used in statistical contexts, particularly in quality control and process management, to refer to the boundaries that define acceptable variation in a process.
Example: "The process is considered stable as long as the measurements remain within a control limit of ±3 standard deviations from the mean."
Alternatives: "a boundary limit of" or "a threshold limit of".
The detection of a significantly high or poor performance was defined as a single point outside the control limits, or two of the three successive points between a warning limit and a control limit on the same side of the central line.
Plasma HIV-1 RNA concentration in these spiked samples was determined using the Roche COBAS Ampliprep/Taqman v2.0 HIV-1 RNA assay with an internal control (Limit of Detection 20 copies/ml).
The lower control limit of the EWMA control chart is −0.4507, and the lower control limit of the CUSUM control chart is −2.8.
Moreover, the lower control limit of the EWMA and the lower control limit of the CUSUM control charts are −0.68 and −1.9, respectively.
First, consider LCL μ 0 and UCL μ 0 as the control limits of μ0 and A as the event of seeing an observation inside the control limits of μ0 (complementing A′), then β can be probabilistically defined as: β = p ( A | B ) = p seeing_an_observation_inside_ UCL μ 0 and LCL μ 0 level shift_happened.
The statistic in Equation 3 is plotted on a T2 control chart with an upper control limit (UCL) of UCL = q m - 1 n - 1 mn - m - q + 1 F α : q, mn - m - q + 1, Open image in new window (4).
However, even a single out-of- control limit observation can signal a true level shift with a certainty factor of p(B|A′).
To illustrate this point, significant improvements in exercise capacity following rehabilitation were demonstrated by McWilliams and colleagues [ 44]; however, a maximum time frame of three weeks between hospital discharge and initiation of the exercise rehabilitation programme and lack of a control group limited interpretation of the results.
If the value of the sample mean is outside the control limits, an out-of-control conclusion points to the need for corrective action in order to return the process to acceptable quality levels.
In such control charts, observation of an out-of-control limit event might be a sign of a level shift.
