<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />Hi,
I am writing a script that generates a second degree polynomial fit and then uses the parameter estimates in further calculations. My problem is the second order parameter estimate term name changes as a function of the input values, when it seems to me it should not. This term name change causes subsequent calculations to fail.
For example, the script below will generate a second degree polynomial fit with the following terms:
Intercept
height
(height-62.55)^2
My question is, why is the second order term name "(height-62.55)^2"? Shouldn't the term name be "height^2"? This name will change as a function of the input values. Is this a bug?
Any insights or workarounds are appreciated.
Thanks!
/*
bigClass=open("$SAMPLE_DATA/Big Class.JMP");
bigClass << Bivariate(
Y( :weight ),
X( :height ),
Fit Polynomial( 2, {Line Color( {213, 72, 87} )} )
);
*/
By default JMP Bivariate Fit Polynomial generates a model with the terms of order 2 and greater centered around the mean of the X variable. It names the coefficients of those terms in a way that communicates what it did.
Instead use Fit Special, make sure neither X nor Y is transformed, change the degree to "2 quadratic" and uncheck "Centered Polynomial".
