6.11 Purity of Coefficients

  • \(r = \frac{\sum (x_i - \bar x)(y_i - \bar y)}{\sqrt{\frac{\sum(x_i - \bar x)^2}{n}\frac{\sum(y_i - \bar y)^2}{n}}}\)
  • \(\rho = 1- \frac{6 \sum d_i^2}{n(n^2-1)}\)
  • b or \(\beta\)

To be continued …