Abstract:
An aim of this paper is to study Lognormal Exponential Weight Moving Average
Control Chart for monitoring of small changes in a parameter. The Average Run Length (ARL) is
used to measure a performance of procedures. We denote that 0 ARL = ARL when the process
is in-control state ,otherwise, 1 ARL = ARL when the process is out-of-control state. The most
common method for evaluation ARL is Monte Carlo Simulation (MC) which their results can
check the accuracy and compare with other methods. However, it is very time consuming.
Consequently, we develope Integral Equations (IE) technique alternatives to MC which the
accuracy are as good as MC and reduce consuming times. Furthermore, the performance of
EWMA and CUSUM are compared which EWMA is superior than CUSUM for the case of low
0 ARL and high 0 ARL when the sizes, of changes is small.