Methodology All RL calculations were completed based on 10,000 Monte Carlo simulations for each scenario, using SAS® V. 9.2 RANNOR and RANGAM functions. The simulations were conducted as follows: 1. Pseudo random numbers from normal, gamma, and t distributions were generated by SAS® V. 9.2 RANNOR and RANGAM functions. 2. The control statistics Yi for EWMA and Z i for DEWMA were computed. 3. The control statistic was compared with an experimental LCL and UCL and a run length was obtained and recorded. 4. After 10, 000 simulation runs, the mean of the 10, 000 derived RL (ARL) and the standard error of ARL (SEARL) values were obtained.