Why Pie Charts are Evil

Pie charts are evil in the same way that the devil is evil: through mental trickery they beguile you, clouding your judgment while giving you the sense that you are making perfectly rational decisions.  Pie charts obscure the very data story that they are meant to tell.  And that – for visual data representation –…

Choosing KPIs: Visitors or Visits?

Recently had a client situation where we were providing the client with monthly organic visitor numbers to their ecommerce site. One of my colleagues showed me a report received from the client, which had the same data, but marked as ‘visits‘.  So that got me thinking…what do they really want to measure here: visitors or…