Lorenz curve and Gini coefficient

[UnixJunkie]

Can be used to compare the ranking power of methods.

[UnixJunkie]

cf. https://en.wikipedia.org/wiki/Lorenz_curve

[UnixJunkie]

maybe implement in linwrap for a prototype first

[UnixJunkie]

import from linwrap

[UnixJunkie]

probably a bug in my Lorenz curve: it should be more curvy

[UnixJunkie]

compare with the results of some R implementation

[UnixJunkie]

https://www.r-bloggers.com/gini-index-and-lorenz-curve-with-r/

[UnixJunkie]

the cross validation of my implementation Vs R failed