Grades are based on expectations for a player, so a "B" for Mika Zibanejad doesn’t look the same as a "B" for Adam Edström.

Non-Linear Least Squares Minimization, with flexible Parameter settings, based on scipy.optimize, and with many additional classes and methods for curve fitting.

in Stata. Stata version 11.2 or newer is required. Some functions may require newer Stata versions.