tailieunhanh - Business process improvement_6

Tham khảo tài liệu 'business process improvement_6', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | . Three-level full factorial designs treatments. Table of treatments for the 33 design These treatments may be displayed as follows TABLE The 33 Design Factor B Factor C 0 Factor A 1 2 0 0 000 100 200 0 1 001 101 201 0 2 002 102 202 1 0 010 110 210 1 1 011 111 211 1 2 012 112 212 2 0 020 120 220 2 1 021 121 221 2 2 022 122 222 Pictorial representation of the 33 design The design can be represented pictorially by FIGURE A 33 Design Schematic http div898 handbook pri section3 3 of 4 5 1 2006 10 30 44 AM . Three-level full factorial designs Two types of 3k designs Two types of fractions of 3k designs are employed Box-Behnken designs whose purpose is to estimate a second-order model for quantitative factors discussed earlier in section 3k-p orthogonal arrays. NIST SEMATECH HOME TOOLS AIDS SEARCH BACK NEXT http div898 handbook pri section3 4 of 4 5 1 2006 10 30 44 AM . Three-level mixed-level and fractional factorial designs ENGINEERING STATISTICS HANDBOOK NOME TOOLS aids SEARCH BACK next 5. Process Improvement . Choosing an experimental design . How do you select an experimental design mixed-level and fractional factorial designs Mixed level designs have some factors with say 2 levels and some with 3 levels or 4 levels The 2k and 3k experiments are special cases of factorial designs. In a factorial design one obtains data at every combination of the levels. The importance of factorial designs especially 2-level factorial designs was stated by Montgomery 1991 It is our belief that the two-level factorial and fractional factorial designs should be the cornerstone of industrial experimentation for product and process development and improvement. He went on to say There are however some situations in which it is necessary to include a factor or a few factors that have more than two levels. This section will look at how to add three-level factors .