# Sørensen-Dice Index - very similar to Jaccard index - Although they are calculated similarly the Sørensen-Dice index is a bit more intuitive because it can be seen as the percentage of overlap between two sets, which is a value between 0 and 1 - overstate the importance of sets with little to no ground truth positive sets - As a result, it could dominate the average score taken over multiple sets - It weights each item inversely proportionally to the size of the relevant set rather than treating them equally. - $D(x,y) = \frac{2|x\cap y|}{|x|+|y|}$ -