Help using Base SAS procedures

how the u-optimal criterion value is calculated in PROC OPTEX?

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Occasional Contributor gxu
Occasional Contributor
Posts: 18

how the u-optimal criterion value is calculated in PROC OPTEX?

Hi All. I am using PROC OPTEX criterion=U-optimal to get a design of n=25 out of 4000 candidate points.

After I run the program, I got the output of the OPTEX Procedure like:

Average distance to design

Design Harmonic
Number Minimum mean
1 0.2043 0.6834
2 0.2051 0.6889
3 0.2051 0.6924
..................................


I want to know how the minimum value is calcuated? I tried the average of sum(d(x,N)). But failed. Then I rescale the data by dividing by their range, then I got a value half of the "Minimum" column.

I will appreciate if someone can provide me some details how SAS get this "minimum" value.

Thanks!
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