This calculator does not have regression (or CDD).
However, the Forum has extraordinary examples linear and nonlinear human regression in the form of CDD.
http://web2.0calc.com/questions/search/?q=by%3Ahappy7
http://web2.0calc.com/questions/search/?q=by%3Acue123smile
Hopefully Melody and CPhill can cure it before they succumb to it, themselves.