iSixSigma

Ljubomir Lazic

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    Ljubomir Lazic
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    First of all you should tel us a priory knowledge about outcome?
    If Second order model of outcome is satisfactory then you should apply CENTRAL COMPOSITE ROTATABLE DESIGNS (CCRD) for k=2 with 5 replica at NULL factor level, which design plan is:

    TABLE 2.147 CCRD

     

    Design of experiment
    matrix

    No of
    exper.

    X1 (factor
    level)

    X2 (factor
    level)

    1

    +

    +

    2

    +

    3

    +

    4

    5

    -1,414

    0

    6

    +1,414

    0

    7

    0

    -1,414

    8

    0

    +1,414

    9

    0

    0

    10

    0

    0

    11

    0

    0

    12

    0

    0

    13

    0

    0

     

     

     
     
    So yu should have 13 experiments in order to get second order regression model for outcam with high confidence. The question is :
    – ar you restricted with number of experiment ( time, expenses etc.)?
    if answer is no then I propose CENTRAL COMPOSITE ROTATABLE DESIGNS (CCRD) for k=2 with 5 replica at NULL factor level.

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