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Tham khảo tài liệu 'engineering statistics handbook episode 7 part 1', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 5.3.3.6.3. Comparisons of response surface designs 1 0 0 -1.682 1 0 0 -1 3 0 0 0 1 0 0 1.682 1 0 0 1 6 0 0 0 6 0 0 0 Total Runs 20 Total Runs 20 Total Runs 15 Factor settings for CCC and CCI three factor designs Table 3.25 illustrates the factor settings required for a central composite circumscribed CCC design and for a central composite inscribed CCI design standard order assuming three factors each with low and high settings of 10 and 20 respectively. Because the CCC design generates new extremes for all factors the investigator must inspect any worksheet generated for such a design to make certain that the factor settings called for are reasonable. In Table 3.25 treatments 1 to 8 in each case are the factorial points in the design treatments 9 to 14 are the star points and 15 to 20 are the system-recommended center points. Notice in the CCC design how the low and high values of each factor have been extended to create the star points. In the CCI design the specified low and high values become the star points and the system computes appropriate settings for the factorial part of the design inside those boundaries. TABLE 3.25 Factor Settings for CCC and CCI Designs for Three Factors Central Composite Circumscribed CCC Central Composite Inscribed CCI Sequence Number X1 X2 X3 Sequence Number X1 X2 X3 1 10 10 10 1 12 12 12 2 20 10 10 2 18 12 12 3 10 20 10 3 12 18 12 4 20 20 10 4 18 18 12 5 10 10 20 5 12 12 18 6 20 10 20 6 18 12 18 7 10 20 20 7 12 12 18 8 20 20 20 8 18 18 18 9 6.6 15 15 9 10 15 15 10 23.4 15 15 10 20 15 15 11 15 6.6 15 11 15 10 15 12 15 23.4 15 12 15 20 15 13 15 15 6.6 13 15 15 10 14 15 15 23.4 14 15 15 20 15 15 15 15 15 15 15 15 16 15 15 15 16 15 15 15 17 15 15 15 17 15 15 15 http www.itl.nist.gov div898 handbook pri section3 pri3363.htm 2 of 5 5 1 2006 10 30 41 AM 5.3.3.6.3. Comparisons of response surface designs 18 15 15 15 18 15 15 15 19 15 15 15 19 15 15 15 20 15 15 15 20 15 15 15 are star points Factor settings for CCF and Box-Behnken three .
