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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.

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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