Modelinb non-normal data using statistical software

The suppliers create control charts and run capability analysis assuming that their data follow a non-normal distribution, which is solved using the calculation capabilities of statistical software. Minitab Statistical Software is used to perform control chart and capability calculations for quality characteristics that do not follow the normal distribution. The suppliers face a problem in purity of tantalum critical to its performance, so suppliers commonly measure trace contaminant levels of elements like iron to demonstrate process stability and capability to high end customers. The natural distribution of a dataset is non-normal so they undergo several ways to determine if the process is in control. The data is transformed to follow normal distribution, in which the standard control chart calculations are applied. The distribution of the data, reveals that the process is stable, with the distribution of the data well described by distribution curves.