cyberspider said:
Cpm (Taguchi's Index ) Superior to Cpk and Ppk ?
Can someone discuss in detail, pros and cons of Cpm ?
Cpm or Cpmk behave much better than cpk/ppk because it takes in account the target. In cases where only one spec is available the calculus of cpk/ppk is a nonesence, but the cpmk can be calculated.
There still all of them have the same problem with distributions that are far from gausian way (in such case; box-cox has shown better behabiur on simulations than other capability index).
Cpm is prefered to Cp because it measures process location and standard deviation.