There was an infographic meme going around in mid-May centred on a heat map Matt Stiles published on his blog showing the most common birthdays in the United States over a period of 25-odd years. Then Andy Kriebel used the same data to create an interactive version in Tableau. (There’s a helpful discussion in the comments.)
A calendar-based heat map is a useful alternative to more traditional line graphs for showing change over time (it’s more original, it looks more interesting), so I decided to make one – by way of learning how to do it in Tableau – using our conception data.
(We crunched birth date data from B.C., Alberta, Ontario and Nova Scotia, deducting 40 weeks, to show an apparent spike in conceptions in the period roughly around Christmas.)
Here’s how it looks: