Centering polynomials calculation
I'm trying to understand how JMP centers polynomials. Here’s an example with two independent variables, x1 and x2, and a response variable y: x1x2y2128041485616908189510201001222105
When using the Analyze->Fit Model option in JMP with x1, x2, x1*x1, and x2*x2 (keeping the "Center Polynomials" checkbox checked), I get the following parameter estimates:- Intercept: 75.375
- x1: 3.0714286
- x2: 0
- (x1-7...