Monitoring a process mean and variance is crucial for statistical process control to ensure product quality and process stability. To monitor the mean and variation of a process independently, ...

This research designed a distribution-free mixed exponentially weighted moving average-moving average (EWMA-MA) control chart based on signed-rank statistic to effectively identify changes in the ...

What Is A Moving Average? Moving averages are important in many time series data applications. The study of moving averages is part of the academic disciplines of statistics and mathematics.