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因为无法完全随机实验只好批次,批间可能存有差异,此时引入Block因子的实验配置(Blocking),
这样的安排利用Block因子而消除批间差异,以下摘自JMP Blog
http://blogs.sas.com/content/jmp ... sing-random-blocks/
Can you give an example?
To be specific, consider an experimental scenario involving four factors where it is possible to perform two runs every day. The engineering team feels that the runs taking place on any given day are more like each other than they are like runs performed on other days. So, they want to remove any day-to-day effect by blocking the design. The team could use a standard design available through the JMP screening design tool. Figure 1 shows the designs choices for four factors. The last choice, a full factorial in 8 blocks of size 2 matches our scenario. |
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