Abstract:
This objective of the research is to find the optimal parameter of EWMA control chart,
such as parameter of EWMA statistical and upper limit control of EWMA control chart when
observations are Poisson distribution for monitoring a change in the process mean (α) , by fix
α = 1.05, 1.10, 1.15, 1.20, 1.25, 1.30, 1.40, 1.50, 1.75 and 2.00 respectively. The 0 ARL (incontrol
ARL) and 1 ARL (out-control ARL) are used for monitoring a change in the process mean
for the case of in-control and out-control states respectively. The methods for approximation ARL
are Monte Carlo Simulation (MC) and the Markovs Chain Approach (MCA). The numerical
results obtained from MCA are as good as from MC, however, MC is very time consuming.
Moreover, the MCA are applied to find an optimal parameter for EWMA design and parameter
will large when size changes are increased.