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Lcheng
Level II

Fit Model - Effect Summary - no PValues?

Question: Why are there no LogWorth and PValues showing up in my Effect Summary section after I Fit Model an output with several inputs & second degree inputs (Factorial to Degree 2)? 

 

Context: 

Everything is continuous except 1 nominal dataset. I first did 6 singular outputs. it gave me some results so I could use that to eliminate the 2 at the end. 

Lcheng_0-1623461317384.png

But then I tried adding 2nd order inputs and: 

Lcheng_1-1623461368116.png

Am I doing something wrong here or interpreting it wrong? 

 

1 REPLY 1

Re: Fit Model - Effect Summary - no PValues?

Not all of the details of your model are provided, but in the second case I see a "Singularity Details" message. That is the cause of your lack of PValues. You have an over-specified model, meaning the collected data is not sufficient to estimate all of the model terms. In mathematical terms you have a matrix that cannot be inverted.

Dan Obermiller