Recta de regressió [b]d'Y sobre X[/b][br][br][math]y=\overline{y}+\frac{\sigma_{xy}}{\sigma_x^2}\left(x-\overline{x}\right)[/math][br][br]Recta de regressió [b]d'X sobre Y[/b][br][br][math]x=\overline{x}+\frac{\sigma_{xy}}{\sigma_y^2}\left(y-\overline{y}\right)[/math][br][br]Coeficient de correlació lineal de Pearson[br][br][math]r=\frac{\sigma_{xy}}{\sigma_x\cdot\sigma_y}[/math][br][br][img]https://upload.wikimedia.org/wikipedia/commons/thumb/d/d4/Correlation_examples2.svg/500px-Correlation_examples2.svg.png[/img][br][size=50]By DenisBoigelot, original uploader was Imagecreator (Own work, original uploader was Imagecreator) [CC0], via Wikimedia Commons[/size]

[url=http://gaussianos.com/hay-que-decirlo-mas-correlacion-implica-causalidad/]Article del blog Gaussianos[/url]