Guessing correlation coefficients

The correlation coefficient (r) describes the strength and direction of the association between two numerical variables. The goal of this page is to allow you to develop an intuition about how strong an association is implied by a given correlation coefficient. Each time you press the button marked "Simulate new data", the app will randomly choose a new correlation coefficient and randomly draw 30 data points with that r. Choose which of the three values best matches the correlation coefficient of the new data.

Developed by Michael Whitlock at the University of British Columbia. Look here for more apps.

This web-page and its code is released on a Creative Commons Zero agreement, meaning that it is freely available for use, re-use, and modification. We request that you give credit, when possible. This work is in the public domain.