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Dice's coefficient

Dice is similar to Jaccard but gives twice the weight to agreements.


$\displaystyle s$ $\textstyle =$ $\displaystyle \frac{2 \vert Q \cap D\vert} {\vert Q\vert + \vert D\vert}$ (12.15)
  $\textstyle =$ $\displaystyle \frac{2p} {2p + q + d}$  

From
http://people.revoledu.com/kardi/tutorial/Similarity/Jaccard.html
http://www.collocations.de/AM/section5.html
http://www.cals.ncsu.edu/course/ent591k/gcextend.html



Maureen Hillenmeyer 2006-05-09