A Factorial Design with Center Points
/****************************************************************/
/* S A S S A M P L E L I B R A R Y */
/* */
/* NAME: FACTEX9 */
/* TITLE: A Factorial Design with Center Points */
/* PRODUCT: QC */
/* SYSTEM: ALL */
/* KEYS: Design of Experiments, Factorial Designs, */
/* PROCS: FACTEX */
/* DATA: */
/* */
/* REF: SAS/QC Software: Usage and Reference, Version 6, */
/* First Edition, Volume 1 and Volume 2 */
/* MISC: */
/* */
/****************************************************************/
proc factex;
factors Current Voltage Time;
output out=Factorial
Current nvals=(12 28)
Voltage nvals=(100 200)
Time nvals=(50 60);
run;
data Center(drop=i);
do i = 1 to 4;
Current = 20;
Voltage = 150;
Time = 55;
output;
end;
data CPDesign;
set Factorial Center;
run;
proc print data=CPDesign;
run;