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swirldev / swirl_courses

:mortar_board: A collection of interactive courses for the swirl R package.
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Course: Regression Models, Lesson 2, about the sum of squares of two tweaks #469

Open RR7-1 opened 4 years ago

RR7-1 commented 4 years ago

sqe(ols.slope+sl,ols.intercept+ic) == sqe(ols.slope, ols.intercept) + sum(est(sl,ic)ˆ2 )

According to the guide, sum(est(sl,ic)ˆ2 ) means sum of squares of two tweaks themselves, but why include the est function instead of typing sum(sl^2, ic^2)?

Thank you.