Correlation refers to the degree of correspondence or relationship between two variables. Correlated variables tend to change together. If one variable gets larger, the other one systematically becomes either larger or smaller. For example, we would...

Referred to as r by statisticians and used as a measure of the interrelatedness of two variables. This coefficient is measured by the formula   A perfect negative relationship has the value −1; a perfect positive relationship +1. Values in...

A measure of correlation among variables, the most commonly treated is the case of two variables. The square of the correlation coefficient gives the proportion of the variance associated with one of the variables which can be predicted from knowledge...

Prague School term designating the relationships between pairs or series of phonemes which are distinguished from one another through the same distinctive feature, e.g. /b, d, g/vs/p, t, k/are related to one another through a voicing correlation (...

In probability theory and statistics, correlation, also called correlation coefficient, indicates the strength and direction of a linear relationship between two random variables. In general statistical usage, correlation or co-relation refers to the...

The well-known fact that Pearson's product-moment correlation coefficient between two variables is the cosine of the angle between the centered variable profiles suggests a way to visualize correlation. This angular representation of product-moment correlation is automatically displayed in an h-plot. Using ideas from...

What moves the gold price? There are lots of theories. The table, below, shows some facts. It shows that a handful of macroeconomic numbers have had significant correlations with the gold price over the past 20 years. Better still, the same things...

Emerging-market, small- and mid-cap exchange traded funds were the top 10 gainers this week. IShares MSCI South Africa EZA and ProShares Ultra Small Cap 600 SAA gained 3.29 and 1.65, respectively, between the close Friday and the close Tuesday. Another big winner was iShares S&P...

It’s often assumed that those who have accumulated great wealth without the benefit of a sizable inheritance must possess a little extra something when it comes to brainpower. Surely, anyone who’s managed to build a fortune from modest beginnings must have a mental edge that...