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D efficiency

parag

Community Trekker

Joined:

Dec 19, 2013

I am new to JMP. In DOE, what is the significance of D efficiency and I efficiency. When I make a custom design model, should the D efficiency be under or over certain value for my design to be useful? In a model I made my D-efficiency is 74 % what does this mean? My design is good/bad/okay?

1 ACCEPTED SOLUTION

Accepted Solutions
Solution

The measures of efficiency are scaled between 0 to 100

The efficiency is a measure of the goodness of a design relative to a hypothetical orthogonal design so they are not useful as absolute measures. They should be used in a relative fashion to compare one design to another. Efficiencies that are less than 100 may be perfectly satisfactory.

3 REPLIES
Solution

The measures of efficiency are scaled between 0 to 100

The efficiency is a measure of the goodness of a design relative to a hypothetical orthogonal design so they are not useful as absolute measures. They should be used in a relative fashion to compare one design to another. Efficiencies that are less than 100 may be perfectly satisfactory.

louv

Staff

Joined:

Jun 23, 2011

A great book on this topic is titled Optimal Design of Experiments by Peter Goos and Bradley Jones.

A key quote from the book with regard to this topic is

"do not recommend focusing on D-efficiency...we find it useful to compute relative D-efficiencies to compare competing designs"

parag

Community Trekker

Joined:

Dec 19, 2013

Thanks a lot LouV. It helps me to feel better about my design!!!