Refer to SAS/ETS User's Guide for details on the ARIMA procedure. The plot, shown in Figure 49.2, indicates that the data are highly autocorrelated with a lag 1 autocorrelation of 0.83.
There is considerable disagreement on how to handle autocorrelation in process data. Consider the following three views: At one extreme, Wheeler (1991b) argues that the usual control limits are ...
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