Correlation coefficients range from -1 to +1, indicating the strength of relationships between variables. Investors use correlation coefficients for portfolio diversification to reduce risk.

What is a correlation coefficient? In this series, we’ve discussed Royal Dutch Shell’s (RDS.A) divestment plan, its Motiva asset division, its stock’s rise above its 50-day moving average, its ...

A coefficient to measure association between two random variables, each distributed on the surface of the unit sphere in p-dimensional space, is proposed, analogous to an existing correlation ...

A parametric test given known variance ratios, and a nonparametric test, both for the equality of correlation coefficients of one variable with a set of other variables, are proposed and their power ...