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the CUSUM plot along with CUSUM based decision plot for the residuals. The CUSUM decision plots
suggests that WIM system had an upward drift that exceed the threshold limit around 83 rd data point.
Figure 30 Predictions on testing sample I
Figure 31 CUSUM based decision interval for testing sample I
Using equation (2-12) estimated shift was calculated as δ=8.28 units. Hence the mean level is updated to
80+8.28=88.28 units. Using the updated mean level and keeping the other AR (1) parameters same,
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