Are Sparklines Smart Lines?

by Stacey Barr |

They’re so hot right now, sparklines. They thankfully bring some sanity to performance dashboards (goodbye goofy gauges). But they do have a limitation no-one seems to be talking about.

Sparklines are the crafty invention of statistician and data display guru Edward Tufte, and presented to the world in his book Beautiful Evidence.

A sparkline is a tiny line chart stripped down to its essential function of showing the time series of a specific measure. They are so tiny they can easily be embedded into text, tables and other tight spaces.

Little wonder Stephen Few has embraced them in his landmark book Information Dashboard Design.

I like them because you cannot manage performance when you’re looking at pie charts and gauges and dials. You need to see change over time.

What’s more, you need to separate the signals of change from the noisy variation that exists in any measure’s time series. And that’s where I think sparklines meet their limitation.

Beyond sparklines…

Sparklines still encourage you to focus too much on the first and last values of your performance measure, rather than the true signals of change that are based on the patterns in the time series, not the points.

Separating signals from noise, and drawing your eye to patterns rather than points, is something XmR charts do well. XmR charts are a specific type of statistical process control chart, discussed in detail (very interesting and readable detail) in Donald Wheeler’s book Understanding Variation.

They are graphs with 3 very important features that make performance measures so much easier to interpret validly.

xmr chart

I wondered what would happen if sparklines courted XmR charts? So I played with it and ended up with something that I reckon absolutely rocks. You get a tiny graphic that works well in text, tables and dashboards AND it is easier and faster and more valid to interpret what performance is really doing.

smartlines

I call them ‘smartlines’. (I would like to call them ‘XmRtlines’, but pronounced ‘smartlines’ – too cryptic though, I think.)

What do you reckon, Stephen Few?

TAKE ACTION: Take the time to learn about XmR charts, and when you build your dashboards, give the smartlines (or XmRtlines) a go!

Upcoming KPI Training


>> Africa, Dubai UAE, 13-15 August 2024

>> UK & Europe, Online Interactive, 30 Sep - 4 Oct 2024

>> North America, Online Interactive, 7-11 October 2024

>> North America, Online Interactive, 4-8 November 2024

>> Africa, Johannesburg SA, 13-15 November 2024

>> UK & Europe, Online Interactive, 9-13 December 2024

Register for the next PuMP Blueprint Workshop near you

Reprinting Articles


You are welcome to use articles from the Measure Up blog, with these requirements

Connect with Stacey


Haven’t found what you’re looking for? Want more information? Fill out the form below and I’ll get in touch with you as soon as possible.

*We respect your email privacy.
Suite 117 Level 14,
167 Eagle Street,
Brisbane Qld 4000,
Australia
Stacey Barr Pty Ltd
ACN: 129953635
Director: Stacey Barr