HP 48G Linear Regression Best Fit Line

[Albert Chan]

(12-20-2021 12:15 AM)Rodger Rosenbaum Wrote:  ... Then the OFIT program becomes:

<< X ORTH * Y - >>

It may make more sense to return ORTH residuals, instead of vertical residuals.
Just multiply above by correction factor 1/√(1+m^2), where m = ORTH slope

1/√(1+m^2) = 1/√(1+tan(θ)^2) = cos(θ)

Bonus:

With ORTH residuals, ordering of X,Y does not matter.
Except for sign difference, we would get the same ORTH residuals.