Correlation Matrix

A correlation matrix is a table showing correlation coefficients between sets of variables. Each variable in the table is correlated with each of the other values in the table, allowing you to see which pairs have the highest correlation.

Anatomy

Anatomy Image for Correlation Matrix
  1. Element 1 and short definition
  2. Element 2 and short definition
  3. Element 3 and short definition

Usage

Use when

  • Representing the statistical correlations between pairs of variables in a set.

Don’t use when

  • Representing the distribution of items across two axis variables, absent of statistical correlation values.
  • Displaying the distribution of a set of items relative to three variables, one of which is expressed through the size of the plotted item. Instead use a bubble chart.

Best Practices

Use a monochromatic or analogous color scale with lighter shades for smaller values and darker shades for larger values. If there's an important central value, you can use a divergent color scale to show differences from the center.

Heatmap

A heatmap visually demonstrates the magnitude of values using variations of color, without numerical labels.