Cp and Cpk both give the process capability, while Cp talks about the data spread and width of the data range, the Cpk talks about the data points near to mean. It shows the exact process capability at current. When CPK is for only short term, PPK is used for long term.The Pp and Ppk provide the overall process capability overview or long-term process capability. Unlike the CPK, PPK cannot be used to predict the future.ģ. The process will be in a state of control in CPK where as it is not like that in PPK.Ģ. When the Process Capability Index shows how a process will do in the future, the Process Performance Index shows how a process performed in the past.ġ. PPK helps in verifying if the sample generated is capable to meet Customer CTQs.ģ. CPK is a measure that tells how close an organisation is in achieving the target and how much consistent an organisation is with regard to average performance. When PPK stands for Process Performance Index, CPK stands for Process Capability Index.Ģ. Root of variance or square root of sum of squares divided by n-1 in the standard formula used for calculating PPK.ġ. On the other hand, Process Performance Index is calculated by using the normal form of standard deviation. R-bar/d2 is the formula used for calculating CPK. Process Capability Index is calculated by taking an estimate of the standard deviation. Unlike the CPK, PPK cannot be used to predict the future as the process in PPK is not in a state of control. It can also be seen that the process will be in a state of control in CPK where as it is not like that in PPK. When the Process Capability Index shows how a process will do in the future, the Process Performance Index shows how a process performed in the past. When CPK is for only short term, PPK is used for long term. On the other hand, PPK or Process Performance Index helps in verifying if the sample generated is capable to meet Customer CTQs. Both PPK and CPK have very wide impacts on the performance strategy of organisations and they are very closely watched.ĬPK or Process Capability Index is an index that measures how a process is running to its specification limits in relation to the natural variability of the process. When PPK stands for Process Performance Index, CPK stands for Process Capability Index. PPK and CPK are mainly process capability indices.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |