Why you need to inspect data visually

I hope Francis Anscombe‘s friends and family will forgive me not noticing his excellent example data until half a centuryย after he published it, but Anscombe’s Quartet is excellent.

Four sets of data which share very similar summary statistics (e.g. mean and variance) but which, when you look at them, are clearly very different in many important ways.

A great reminder of why you need to inspect data visuallyย and not just rely on automated number crunching:

Anscombe's Quartet - diagram showing the four datasets. Image CC BY-SA 3.0 courtesy of Avenue on Wikimedia Commons -


There are 3 comments

Share your views

Your email address will not be published. Required fields are marked *

All comments and data you submit with them will be handled in line with the privacy and moderation policies.