Quality and Reliability Methods - SAS

72 Shewhart Control Charts Chapter 5
Shewhart Control Charts for Variables
Figure 5.1 Variables Charts for Coating Data
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You can use Fit Y by X for an alternative visualization of the data. First, change the modeling type of
Sample to Nominal. Specify the interval variable Weight as Y, Response and the nominal variable Sample
as X, Factor. Select the Quantiles option from the Oneway Analysis drop-down menu. The box plots in
Figure 5.2 show that the sixth sample has a small range of high values.
Figure 5.2 Quantiles Option in Fit Y By X Platform
All values in
sample six are
high.