Bland–Altman plot
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Bland–Altman plot example
A Bland–Altman plot (Difference plot) in analytical chemistry and biostatistics is a method of data plotting used in analyzing the agreement between two different assays. It is identical to a Tukey mean-difference plot, the name by which it is known in other fields, but was popularised in medical statistics by J. Martin Bland and Douglas G. Altman.[1][2]
Healthy Algorithms 
I drafted this weeks ago, but I made a “Bland-Altman” plot yesterday, so I’m glad I know a fancy name for it. Have a look: http://nbviewer.ipython.org/gist/aflaxman/6694f4c9de8ea16fba74