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QQPLOT Statement |
See CAPQQ1 in the SAS/QC Sample Library |
In a normal Q-Q plot, the normal
distribution with mean and standard deviation
is represented by a reference line
with intercept
and slope
.The following statements reproduce the Q-Q plot in
Figure 10.1, adding
the
line for which
and
are estimated by the sample mean and standard deviation:
title 'Normal Quantile-Quantile Plot for Hole Distance'; legend1 frame cframe=ligr cborder=black position=center; proc capability data=sheets noprint; spec lsl=9.5 llsl=2 clsl=blue usl=10.5 lusl=20 cusl=blue; qqplot distance / normal(mu=est sigma=est color=yellow l=2 w=2) square nospeclegend cframe = ligr legend = legend1; run;
The plot is displayed in Figure 10.3.
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Specifying MU=EST
and SIGMA=EST
with the NORMAL option requests the reference
line
(alternatively, you can specify numeric values for
and
with
the MU= and SIGMA= options).
The COLOR= and L= options
specify the color of the line and the line type.
The SQUARE option
displays the plot in a square format, and the
NOSPECLEGEND option
suppresses the legend for the specification lines.
The LLSL=, LUSL=, CLSL=, and CUSL= options in the
SPEC statement specify line types and colors for the
specification limits.
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