Lie factors | Musings on Education

I’ve posted about my opinions over the “audience” of charts and graphics mattering. Take the above for example, direct from a school website. I wonder if the vast majority of parents would know what “Contextually Similar” meant and what the relevance of it is?

The y-axis is scaled from 86 to 98 – definitley non standard. Indeed, the 6% difference between 2012 and 2014 covers approximately 50% of the height of the graph – giving a lie factor of 8.33. I’ve reported before on lie factors bigger than 1.05 as being poor practice (see lie factors) (FYI – for this school with a standard…

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