An EWMA Mean Control Chart for Skewed Population Based on Scaled Weighted Variance Method

Reference 14 gives the control lines of shewhart mean control chart for skewed population which is unknown based on scaled weighted variance method.This paper according to the results,spread it to exponentially weighted moving average chart,gives the control lines of exponentially weighted moving average chart based on the skewed population which is unknow,then makes a simulation to the effect of exponentially weighted moving average chart based on quality characteristic according to log-normal distribution.