turn on suggestions

Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.

Showing results for

- JMP User Community
- :
- Discussions
- :
- Bivariate Equation Question

Topic Options

- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Get Direct Link
- Email to a Friend
- Report Inappropriate Content

Dec 9, 2016 7:28 AM
(2331 views)

Running the Bivariate Fit leads to the (numerically correct)result:

Absorbance = -0.506803 + 0.0005822*Wavenumber + 6.0486e-5*(Wavenumber-861.488)^2

This is problematic when comparing to other analysis programs.

Is it possible to have JMP not use "(Wavenumber-861.488)" and just use Wavenumber?

Why does JMP do this in the first place?

Thanks for any insight.

1 ACCEPTED SOLUTION

Accepted Solutions

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Get Direct Link
- Email to a Friend
- Report Inappropriate Content

Dec 9, 2016 7:37 AM
(4650 views)

Solution

JMP is centering the equation... There are a bunch of reasons for why it's doing this, but you can turn it off if you use the "fit special" option rather than "the polynomial..." option under the red triangle. Just select the degree of the polynomial and uncheck "Centered Polynomial."

Best,

M

1 REPLY

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Get Direct Link
- Email to a Friend
- Report Inappropriate Content

Dec 9, 2016 7:37 AM
(4651 views)

JMP is centering the equation... There are a bunch of reasons for why it's doing this, but you can turn it off if you use the "fit special" option rather than "the polynomial..." option under the red triangle. Just select the degree of the polynomial and uncheck "Centered Polynomial."

Best,

M