Presenting Data: How to Communicate Your Message Effectively
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About this ebook
A clear easy-to-read guide to presenting your message using statistical data
Poor presentation of data is everywhere; basic principles are forgotten or ignored. As a result, audiences are presented with confusing tables and charts that do not make immediate sense. This book is intended to be read by all who present data in any form.
The author, a chartered statistician who has run many courses on the subject of data presentation, presents numerous examples alongside an explanation of how improvements can be made and basic principles to adopt. He advocates following four key ‘C’ words in all messages: Clear, Concise, Correct and Consistent. Following the principles in the book will lead to clearer, simpler and easier to understand messages which can then be assimilated faster. Anyone from student to researcher, journalist to policy adviser, charity worker to government statistician, will benefit from reading this book. More importantly, it will also benefit the recipients of the presented data.
‘Ed Swires-Hennessy, a recognised expert in the presentation of statistics, explains and clearly describes a set of “principles” of clear and objective statistical communication. This book should be required reading for all those who present statistics.’
Richard Laux, UK Statistics Authority
‘I think this is a fantastic book and hope everyone who presents data or statistics makes time to read it first.’
David Marder, Chief Media Adviser, Office for National Statistics, UK
‘Ed’s book makes his tried-and-tested material widely available to anyone concerned with understanding and presenting data. It is full of interesting insights, is highly practical and packed with sensible suggestions and nice ideas that you immediately want to try out.’
Dr Shirley Coleman, Principal Statistician, Industrial Statistics Research Unit, School of Mathematics and Statistics, Newcastle University, UK
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Book preview
Presenting Data - Ed Swires-Hennessy
Chapter 1
Understanding number
This chapter deals with the basics of how users perceive numbers and how they should be presented to allow maximum uptake of the meaning of the data.
A false assumption of many who seek to communicate numerical information is that their audience is as able to handle the information as they are. The available data in for the majority of OECD countries is that numeracy skills are significantly below those for literacy.
Numeracy skills in the general population in England are poor – and are not improving. Information from a skills survey in England in 20111 noted that Numeracy skills had declined slightly since the last survey in 2003. Seventeen million adults in England in 2011 (just under half the working-age population) were at ‘Entry Levels’ in numeracy – roughly equivalent to the standards expected in primary school. Further, the survey showed that 78% of the working-age population were at or below level 2 numeracy. These people may not be able to compare products and services for the best buy, or work out a household budget; essentially they would not achieve a good mark in a mathematics examination at age 16.
More generally, the OECD published the results of a survey in October 20132 showing that 19% of adults in 21 countries had mathematics skills at the level of a 10-year-old. These adults could only manage one-step tasks with sums, sorting numbers or reading graphs: many could only perform sums with money or whole numbers. For individual countries, the percentage at this level of numeracy ranged from 8% in Japan to 32% in Italy. A selection of the results is shown in Figure 1.1. For England and Northern Ireland, the estimate is that around 8.5 million adults are at this level.
Figure 1.1 Adult population with only basic numeracy skills.
1.1 Thousands separator
When considering a number with more than three digits, most of us will not take in the whole number but will try to understand it. If the number is just a set of digits together without any separators, most will try to find the place for thousands separators to form the basis of understanding the number. Then, depending on the size of the number, will try to do some rounding to understand the number and put it into our mental understanding range.
Example 1.1 ............
Let us consider a number which represents the population of a country.
numbered Display EquationHow do we try to understand the number? None could honestly say they could read the digits as given and fully understand it without any other process going on in our brains.
So what do we do?
First our brains need a little help. We can introduce separator characters to split the digits into groups of three, starting from the right-hand side. These separators are known as ‘thousands separators’. In some countries (United States and United Kingdom), the separator is a comma; for much of Europe, the separator is a space but in some European countries a full stop is used. I visited one country's statistical office website and found three different practices: comma, space and nothing used for the separator! Whichever is chosen, it must be consistently used throughout an organisation's