Interactive MA plot

The New York Times has an interesting interactive graphic on boys’ and girls’ average scores on a science exam, by country.

Science scores

It’s nice to see a scatterplot. (Often one would see just a bar plot, with female and male bars side-by-side.) Even better, this is an “MA plot.” That is, rather than just plot males vs females, they show the difference vs the average.

The wikipedia entry for MA plot says such a plot of difference vs average is in medical statistics known as a Bland-Altman plot and in other fields is known as a Tukey mean-difference plot.

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