What is the difference between PPK and Cpk?
So the key takeaway is that Cpk is the potential of a process to meet a specification (short term) while Ppk is how the process actually did (long term). Another way to look at the difference is that Cpk is used for a subgroup of data, while Ppk is used for the whole process.
What is the difference between Cpk and CP?
The main difference between Cp and Cpk is that Cp analyzes the ability of a process to justify the structured specification for a product. While Cpk portrays the deviation of a process from the center within the tolerance range. Cp is termed as Process Capability. Cpk is Process Capability Index.
How Cpk and PPK are calculated?
If we look at the formulas for Cpk and Ppk for normal (distribution) process capability, we can see they are nearly identical: The only difference lies in the denominator for the Upper and Lower statistics: Cpk is calculated using the WITHIN standard deviation, while Ppk uses the OVERALL standard deviation.
Should Cpk be greater than PPK?
The automotive confusion aside, Ppk will always be greater than Cpk since Ppk is long term capabliity and Cpk is short term capability. The only way that Cpk will be greater than Ppk (other than a misuse of the terms and formulas) is under the conditions stated in a previous post.
What is PPK and RTK?
Real Time Kinematic (RTK) is a GPS correction technology technique that provides real-time corrections to location data as the drone is surveying and capturing images from a site. Post Processed Kinematic (PPK) is a GPS correction technology technique that corrects location data after it is collected and uploaded.
What does a negative CPK or PPK indicate?
What does a negative Cpk indicate? As seen from the examples above, a negative Cpk indicates that the process average is outside the specification limits . Most of the readings are outside the specifications i.e. they are rejects.
What is a good CPK?
Creatine phosphokinase (CPK) is an enzyme that can be found in the heart, brain and skeletal muscle. A high level of CPK is not a good sign and is an indicator of heart attacks, strokes and other serious diseases. However some prescription drugs and other substances can cause levels of CPK to increase.
What is an acceptable PPK?
According to Six Sigma philosophy, Cp or Pp and Cpk or Ppk should be greater than 1.50. From a technical standpoint, Six Sigma deems a process being acceptable only after achieving a maximum defect rate of 3.4 parts per million opportunities. Also, how do you read a PPK? Generally, higher Ppk values indicate a more capable process.
What is CPK report?
A CPK is a log file generated by Driver Test Manager , a component of Microsoft Windows Logo Kit device certification software. The file contains a testing report, which logs information about a hardware device. It is used to submit test results to Microsoft to certify a device for Windows, and for debugging failed tests.