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By: a guest on May 1st, 2012  |  syntax: Python  |  size: 0.29 KB  |  hits: 17  |  expires: Never
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  1. def gini(g,m,k):
  2.  
  3.     WL = compute_WL(g,m,k)
  4.     WL_sorted = sorted(WL.items(), key=lambda (k,v): v)
  5.     a = b = 0.0
  6.     rank = 1
  7.     for s, lw_s in WL_sorted:
  8.         a = a + rank * lw_s
  9.         b = b + lw_s
  10.         rank = rank + 1          
  11.     return 2.0/((m-1)*b) * a - (m+1) / (m-1)
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