add SSR print to simple_reg

ScPoEcon / ScPoEconometrics

Undergraduate textbook for Econometrics with R

https://ScPoEcon.github.io/ScPoEconometrics/

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Closed floswald closed 6 years ago

floswald commented 6 years ago

add SSR, sum of errors (not squared), sum of absolute errors to simpe_reg. just print below.