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SCHART Statement |
See SHWSCHR in the SAS/QC Sample Library |
In the previous example, the OUTLIMITS= data set TURBLIM saved control limits computed from the measurements in TURBINE. This example shows how these limits can be applied to new data. The following statements create an s chart for new measurements in the data set TURBINE2 (not listed here) using the control limits in TURBLIM:
title 'Chart for Standard Deviations of Power Output'; symbol v=dot c=salmon; proc shewhart data=turbine2 limits=turblim; schart kwatts*day / cframe = vligb cinfill = ywh cconnect = salmon; run;
The chart is shown in Figure 40.8.
The LIMITS= option in the PROC SHEWHART statement specifies the
data set containing the control limits.
By default,*
this information is read from the first
observation in the LIMITS= data set for which
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All the standard deviations lie within the control limits, indicating that the variability of the heating process is still in statistical control.
In this example, the LIMITS= data set was created in a previous run of the SHEWHART procedure. You can also create a LIMITS= data set with the DATA step. See "LIMITS= Data Set" for details concerning the variables that you must provide.
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