Lies, Damned Lies, and Statistics (43): Cherry Picking Time Frames

comment 1
lies and statistics / statistics

I’ve shown before how misleading it can be to pick a very particular start or end date in a statistical time series for which more data are available than the data you choose to show. Here’s another example: in an effort to whip up some old fashioned hatred of asylum seekers, the French newspaper Le Figaro offered this graph:

asylum seekers france

(source)

A continuous and steep rise in the numbers! 70% increase in 5 years! Take it easy I would say. The increase would have looked a lot less ominous had they chosen to start the y-axis at 0 instead of 30.000. The most important bit of manipulation, however, occurs in the x-axis: go a bit further back in time, and you get this (look at the green line):

image002-9ebe3

But of course they don’t want to take it easy. Angst is precisely the point, and choosing the low-point of 2007 as the cherry-picked starting date of the graph is intended to maximize angst. They don’t want people to realize that the current numbers are nothing more than a return to normal.

With thanks to @jacksometer for the pointer.

Another, more sophisticated way to manipulate the x-axis in a graph is described here. More posts in this series are here.

1 Comment

  1. Pingback: Lies, Damned Lies, and Statistics (47): Cherry Picking Time Series | P.a.p.-Blog // Human Rights Etc.

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