Ch 5 · Correlation and Regression

🧮 Formula sheet

1. 1.r = Σ[(x − x̄)(y − ȳ)] / √[Σ(x − x̄)² · Σ(y − ȳ)²]
2. 2.Spearman R = 1 − 6Σd² / [n(n² − 1)]
3. 3.Regression Y on X: byx = r(σy/σx)
4. 4.Regression X on Y: bxy = r(σx/σy)
5. 5.r² = byx · bxy (Coefficient of determination)