Spearman's Rank Correlation Coefficient

1. Feb 14, 2005

This is the equation for the Rank Correlation Coefficient:
$$1- \frac {6 \sum d^2} {n(n^2-1)}$$

can anyone explain the 6?
why a six? i don't see the link.

2. Feb 14, 2005

ohwilleke

Last edited by a moderator: Apr 21, 2017