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Feb 6, 2017 5:49 PM
(1184 views)

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Feb 6, 2017 6:08 PM
(2296 views)

Solution

First of all, are you really screening four factors? Do you expect only one or two of them to be active?

Second of all, the power of detecting important effects for up to half the number of factors goes up very quickly with the addition of the four optional runs. The DSD is very economical but counts on the screening assumptions to hold. So if fewer than half of fhe factors are active, if the effects are 3-5 times the response standard deviation, the power becomes dramatically higher with the additional runs.

The additional runs are optional. They are added by default but you can change that behavior. Design identical experiments except include the extra four runs one time and remove them the other time. Compare the Design Evaluation information for both.

Learn it once, use it forever!

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Feb 6, 2017 6:08 PM
(2297 views)

First of all, are you really screening four factors? Do you expect only one or two of them to be active?

Second of all, the power of detecting important effects for up to half the number of factors goes up very quickly with the addition of the four optional runs. The DSD is very economical but counts on the screening assumptions to hold. So if fewer than half of fhe factors are active, if the effects are 3-5 times the response standard deviation, the power becomes dramatically higher with the additional runs.

The additional runs are optional. They are added by default but you can change that behavior. Design identical experiments except include the extra four runs one time and remove them the other time. Compare the Design Evaluation information for both.

Learn it once, use it forever!

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Feb 14, 2017 11:44 AM
(1115 views)