To obtain a combined estimate of , you can use the MEANS procedure to average the average ranges in BASELIM and then divide by the unbiasing constant d 2. proc means data=baselim noprint; var _r_; ...
The difference-from-nominal chart should be accompanied by a test that checks whether the variances for each product type are identical (homogeneous). Levene's test of homogeneity is particularly ...
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