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I have read the B-J original book again, I find that your simulation is wrong,

because they simulated according to the 2 factorical design replicated three times,

this means that the two input has no correlation,

Hence, you should design your factorial to keep the multi-inputs being uncorrelation

[此贴子已经被作者于2009-6-9 12:31:03编辑过]