Distribution-free Phase II triple EWMA control chart for joint monitoring the process location and scale parameters

Distribution-free or nonparametric control charts are used for monitoring the process parameters when there is a lack of knowledge about underlying distribution. In this paper, we investigate single distribution-free triple exponentially weighted moving average chart based on Lepage statistic (referred as TL chart) simultaneously shifts in unknown location and scale univariate continuous The design implementation proposed discussed using time-varying steady-state limits zero-state case. run-length distribution evaluated by performing Monte Carlo simulations. performance compared to those existing EWMA-Lepage (EL) DEWMA-Lepage (DL) charts. It observed that with limit superior its competitors, especially small moderate parameters. We also provide real example from manufacturing illustrate application chart.