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{"id":600,"date":"2018-04-30T09:27:14","date_gmt":"2018-04-30T08:27:14","guid":{"rendered":"http:\/\/www.latestquality.com\/?p=600"},"modified":"2018-04-30T09:27:14","modified_gmt":"2018-04-30T08:27:14","slug":"cp-and-cpk-values","status":"publish","type":"post","link":"https:\/\/www.latestquality.com\/cp-and-cpk-values\/","title":{"rendered":"What Is the Benefit of Cp and Cpk Values"},"content":{"rendered":"

The Cp and Cpk are well known capability indices commonly used to ensure that a process spread is as small as possible compared to the tolerance<\/a> interval (Cp), or that it stays well within specifications (Cpk).<\/p>\n

Another type of capability index exists which is referred to as CPM. This capability index is much less known and used less frequently. The main difference between the CPM and other capability indices is that the bias from the target is directly taken into consideration in the CPM. The bias is the difference between the process average and the target.<\/p>\n

In Minitab, as soon as a target is entered into the capability analysis a CPM gets calculated automatically. To obtain a good CPM, a process needs to be right on target, whereas to get a satisfactory Cpk value, a process simply needs to stay well within specifications. This might seem to lead to the same conclusion; however, there is an obvious and significant difference. With the CPM, a direct penalty is incurred for not being exactly on target.<\/p>\n

When we speak about the capability of processes we often refer to a couple of indices called Cp and Cpk values. These two indices, used together, can tell us how capable our process is and whether or not we have a catering issue. For the math geeks out there here are the formulas for calculating Cp and Cpk values. The loss function essentially says that the further a product is from the target value, the greater the quality problems encountered by the costumers. This is where the process capability index or Cp comes into play.<\/p>\n

Definition of Cp and Cpk Values<\/h2>\n

Cp is a measure of a process\u2019s ability to meet a specification. The formula for calculating Cp is as follows.<\/p>\n