Finicade
Data Apprentice Lv 1
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Level 3 · ◆◆ · ~11 min

Slopes, Fits & Residuals

Slopes, Fits & Residuals

"What the two numbers mean, why the intercept is often nonsense, and three algebraic facts about residuals that are always true."

interpreting the slope as a marginal effectinterpreting (and mistrusting) the interceptunits of measurementprediction with fitted valuesalgebraic properties of OLS residuals
🚀 You're jumping ahead. This builds on Ordinary Least Squares — but play it now and you'll still earn full XP. If it feels steep, those make a gentler on-ramp.

A short lesson, then a quiz. ❤️×3 — a wrong answer costs a heart; finish with at least one left and the level is yours. Lose all three and you'll have to try again. Replay any time — XP and cleared levels are never lost.