Finding process capability index for non normal data using Clements method involves computing the first four moments. Specifically the skewness and kurtosis are used in getting a value of standardized tails of Pearson curves(STPC) (from the Gruska table) which are then used in computing the Up and Lp.
We are conducting a simulation study in R to compare a method with the Clements method. We are at lost on which R package can be loaded into our code for determination of STPC. If none, can you kindly give us a lead on how to write a code to generate the values of STPC?