Finicade
Data Apprentice Lv 1
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Level 4 · ◆◆ · ~11 min

Goodness of Fit: R²

Goodness of Fit: R²

"Split the variation in y into 'explained' and 'left over', turn it into a 0-to-1 score — then learn what that score does and doesn't tell you."

total sum of squares (SST)explained sum of squares (SSE)residual sum of squares (SSR)R² = SSE/SST = 1 − SSR/SSTR² = r² and its limits
🚀 You're jumping ahead. This builds on Slopes, Fits & Residuals — 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.