What is PP PPL PPU PPK?
Ppk. Ppk is a measure of the overall capability of the process and equals the minimum of PPU and PPL. Ppk is a ratio that compares two values: The distance from the process mean to the closest specification limit (USL or LSL) The one-sided spread of the process (the 3-σ variation) based on its overall variation.
What is PP and PPK?
Process Performance Metrics. Pp is the performance index. It measures how well the data might fit between the spec limits (USL, LSL). It doesn’t care if the process is centered within the limits only if it would fit if it was centered. Ppk is the performance centering index.
What is PP PPK CP Cpk?
Cp, Cpk, Pp and Ppk are all parameters (indices) that can help us to understand how our process is operating relative to the specifications, or in other words, they measure how close our process is running to its specification limits. For requirements we measure the process specifications.
What is PPK?
Ppk is an index of process performance which tells how well a system is meeting specifications . Ppk calculations use actual sigma (sigma of the individuals ), and shows how the system is actually running when compared to the specifications.
What PPK value is good?
For stable processes and normally distributed data, a Cpk value ≥ 1.33 should be achieved. For chronically unstable processes with output meeting specification and a predictable pattern, a Ppk value ≥ 1.67 should be achieved.”
How do you find PP and PPK?
Pp, Ppk In Relation to Z Scores Ppk can be determined by diving the Z score by three. A z score is the same as a standard score; the number of standard deviations above the mean. Z = x – mean of the population / standard deviation.
What is PP index?
The Pp index is used to summarize a system’s performance in meeting two-sided specification limits (upper and lower). Like Ppk, it uses actual sigma (sigma of the individuals ), and shows how the system is actually running when compared to the specifications.
What is PPK in survey?
That’s why PPK stands for “post-processing kinematic.” In a PPK workflow, the drone attaches geocoordinates to each image based on an onboard GPS. Also during flight, a base unit (which could be a base station, an AeroPoint, or CORS network) also records positional information, but with more accurate triangulation.
What does a PPK value of 1 mean?
A Ppk of 1 means that there is “half of a bell curve” between the center of the process and the nearest specification limit. That means your process is completely centered.
What is PPK formula?
Ppk can be determined by diving the Z score by three. A z score is the same as a standard score; the number of standard deviations above the mean. Z = x – mean of the population / standard deviation. Ppk = ( USL – µ) / 3σ = z / 3.