I've been working with some growth data and trying to predict some missing data. Ordinarily, polynomial models fit my data best; however, I've found that a few variables are best fit by "distance weighted least squares" in a scatter plot:

Q1: How do I find the equation coefficients for this model to use to predict data?

Q2: Is there a procedure in the software to test the fit and calculate the residuals for this line?

Thanks!

PS, I'm using v10