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CDFPLOT Statement |
See CAPCDF1 in the SAS/QC Sample Library |
This section introduces the CDFPLOT statement with a simple
example. A company that produces fiber optic
cord is interested in the breaking strength of the cord.
The following statements create a data set named CORD,
which contains 50 breaking strengths measured in
pounds per square inch (psi), and they display the cdf
plot in Figure 2.1. The plot shows a
symmetric distribution with observations concentrated
6.9 and 7.1. The plot also shows that
only a small percentage (<5%) of the observations
are below the lower specification limit of 6.8.
data cord; label strength = 'Breaking Strength (psi)'; input strength @@; datalines; 6.94 6.97 7.11 6.95 7.12 6.70 7.13 7.34 6.90 6.83 7.06 6.89 7.28 6.93 7.05 7.00 7.04 7.21 7.08 7.01 7.05 7.11 7.03 6.98 7.04 7.08 6.87 6.81 7.11 6.74 6.95 7.05 6.98 6.94 7.06 7.12 7.19 7.12 7.01 6.84 6.91 6.89 7.23 6.98 6.93 6.83 6.99 7.00 6.97 7.01 ;
title 'Cumulative Distribution Function of Breaking Strength'; legend1 frame cframe=ligr cborder=black position=center; proc capability data=cord noprint; spec lsl=6.8 llsl=2 clsl=black; cdf strength / cframe = ligr legend = legend1; run;
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