4. A proposed method for processes subject to linear trend
Since the focus of this study is on the process with linear trend, a Fahmy and Elsayed’s proposed method is further investigated. The method consists of the following steps: the Shewhart chart will be used to detect the trend, the change point and trend slope is estimated by using MLE and the adjustment will follow the equation 5-7. However; before completely implementing this method, the reproduction of the different true trend slope at specific change point is performed. The reproduction result is shown in Table 3.