Add mape and rsae functions

tidyverse / modelr

Helper functions for modelling

https://modelr.tidyverse.org

GNU General Public License v3.0

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Add mape and rsae functions #33

Closed paulponcet closed 6 years ago

paulponcet commented 7 years ago

mape is the mean absolute percentage error; rsae is the relative sum of absolute errors.

hadley commented 6 years ago

Can you please add a bullet to NEWS? It should briefly describe the change (starting with name of the function), and crediting yourself with (@yourname, #issuenumber).