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Tom West

I have seen the "±" sign used to mean "approximately", and I think that is its meaning here. A better symbol is the tilde, "~". (Apologies to anyone with a screenreader).

Martin

The great "advantage" of infographics over statistical graphics is that their only (?) purpose is to make a point. In trying to achieve this, they may utilize many different means to grab the readers attentions - something statisticians are definitely not trained for. So the verdict over an infographics from a statistical point of view should check:
(i) is it based in serious data
(ii) is potential extra information (not based on data) obscuring the message
(iii) is the point of the graphics statistically sound enough

If all three points are ok, why bothering over details.

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Marketing analytics and data visualization expert. Author and Speaker. Currently at Vimeo and NYU. See my full bio.

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