6.6 Correlation Matrix

It is common in some fields to report the correlation between every available pair of numerical variables and arrange these in a table. The rows and columns of the table name the variables, and the cells of the table hold the correlations.

A table that shows all of the correlations among a collection of numerical variables is known as a correlation matrix. Correlation matrices are compact and convey a lot of information at a glance. They can be an efficient way to explore a large set of variables because they summarize the pairwise relationships.

Caution

Before relying on a large table of correlations, be sure to review the checklist ...

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