A quick exercise for aspiring data journalists

A funnel plot of bowel cancer mortality rates in different areas of the UK

The latest Ben Goldacre Bad Science column provides a particularly useful exercise for anyone interested in avoiding an easy mistake in data journalism: mistaking random variation for a story (in this case about some health services being worse than others for treating a particular condition):

“The Public Health Observatories provide several neat tools for analysing data, and one will draw a funnel plot for you, from exactly this kind of mortality data. The bowel cancer numbers are in the table below. You can paste them into the Observatories’ tool, click “calculate”, and experience the thrill of touching real data.

“In fact, if you’re a journalist, and you find yourself wanting to claim one region is worse than another, for any similar set of death rate figures, then do feel free to use this tool on those figures yourself. It might take five minutes.”

By the way, if you want an easy way to get that data into a spreadsheet (or any other table on a webpage), try out the =importHTML formula, as explained on my spreadsheet blog (and there’s an example for this data here).

About these ads

2 thoughts on “A quick exercise for aspiring data journalists

  1. Carlos

    Then the story can focus on explaining the important things, like Glasgow, or if the differences between Southampton/Belfast and Canterbury/Westminster are just random, or can be explained by income or number of treatment facilities per thousand inhabitants.

    Reply
  2. Pingback: Power Tools for Aspiring Data Journalists: R « OUseful.Info, the blog…

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s