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Jan 12, 2012 7:09 PM
(815 views)

Hey everyone,

I've attached an excel file that has some data (One dependent variable = WTP, and two independent variables).

The second tab has the regression output from excel, which we've used in classes at school all the time. What I don't understand is why regressing the same variable as least squares fit in JMP produces a different adjusted R^2, coefficients, p-values, etc.

Can anyone help me address any settings, etc. that might be taking place?

I'm using JMP 9 and excel's data analysis toolkit in Office 2010.

Thanks,

Diego

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Solution

I tried to reproduce the analysis in JMP and I got exactly the same numbers as in your file's second tab. Run the saved script of the model I used and look for what differ from the model you tried in JMP.

Fit Model**(**

Y**(** :WTP **)**,

Effects**(** :Name**(** "Frozen/Fresh" **)**, :Name**(** "Wild/Farmed" **)** **)**,

Keep dialog open**(** **1** **)**,

Personality**(** "Standard Least Squares" **)**,

Emphasis**(** Effect Leverage **)**,

Set Alpha Level**(** **0.05** **)**, Run

**)**;

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I tried to reproduce the analysis in JMP and I got exactly the same numbers as in your file's second tab. Run the saved script of the model I used and look for what differ from the model you tried in JMP.

Fit Model**(**

Y**(** :WTP **)**,

Effects**(** :Name**(** "Frozen/Fresh" **)**, :Name**(** "Wild/Farmed" **)** **)**,

Keep dialog open**(** **1** **)**,

Personality**(** "Standard Least Squares" **)**,

Emphasis**(** Effect Leverage **)**,

Set Alpha Level**(** **0.05** **)**, Run

**)**;

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Jan 13, 2012 8:20 AM
(632 views)

Thanks MS,

It looks like my excel isn't set up correctly.

Cheers mate!,

Diego

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Jan 13, 2012 8:31 AM
(632 views)

How different are your results?

Since Excel treats numeric data differently than either JMP and SAS and since it also has its own regression algorithms, I would not be suprised to see differences. If differences are minor, then I would suspect these might account for the differences.

If the differences are large, I would suspect an issue with Excel and not with your excel setup.

Can you post your JMP results?