As a participant your take-away is at opposite ends of the spectrum – from feeling confused and disillusioned, to feeling like you could make a difference with your newfound knowledge and insights.
The difference lies in the presenter and their ability to communicate using data. The underlying principles of communicating with data are exactly the same as with any other form of communication – it is the presentation of quantitative information in an easily digestible manner.
In 1949, two employees at Bell Laboratories – Claude Elwood Shannon and Warren Weaver published a seminal article called ‘The Mathematical Theory of Communication’. In it they identified three types of communication problems:
The effectiveness problem is probably the most important of these three – the ‘so what’? If data is perfectly created, captured, transmitted, and understood but the recipient doesn’t care at the end of it, then ultimately the communication failed. So, how can we communicate data in a manner that is not only understood, but that fulfils the original goal?
Who is your target audience? What do you want them to know? What action do you want them to take?
Sometimes a whole presentation can be focused around a single number, other times you need to use enough data to ensure your findings are meaningful and statistically significant. However, always be conscious of overwhelming people – just because you’ve done a huge amount of analysis doesn’t mean you have to share the finite detail. This serves to confuse.
There seems like an infinite number of options for visualising data, but there are frameworks such as Jock Mackinlay’s ‘Quantitative, Ordinal and Nominal’, that recommend the best visual approach depending on your data set and type. The main objective to keep front of mind is ‘does this visualisation get across the point I am trying to make’.
Willard Cope Brinton referred to the ‘judicious embellishment of charts.’. The trap we commonly fall into is we beautify data visualisations to the extent that we distract, confuse or worse distort the data. However, it is possible to elegantly design and around interest / enhance memory. Stay away from multiple fonts, clashing colour scheme, sloppy alignment, vertical or angled labels, thick grid lines or borders and useless images and clip art.
Take care when selecting the ‘how, when and where’, so that you can reach the right audience and achieve your goal. Ask yourself whether you need graphics or narration- or both? Will you present live or pre-recorded or stand-alone? Generally, the more complex the data set, the more likely you will need to combine media types and present in person or remotely. There is also the trade-off between cost and impact to consider. Your goal will inform these decisions.
Make sure you achieved your goal. Did your audience receive the message? Did they understand it? Did it have the right impact on them?
When Hans Rosling took to the stage in 2006 to present his GapMinder scatterplot he redefined how to present and communicate data. The data was complex, the communication was complex, but it was brilliantly executed and left a deep, long-term impact.
Communication of data is fundamental to Data Analytics. In the words of Willard Cope Brinton: “As the cathedral is to its foundation so is an effective presentation of facts to the data.”