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The 2

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Hi folks,

I don't agree with your formula and deleted the "2" on top!!

Greetings from Germany (where the "Sørensen similarity index" hopefully isn't different from yours) —Preceding unsigned comment added by 82.83.155.191 (talkcontribs)

Hello everyone

I brought back the "2" in the upper term as this is absolutely correct. (e.g. Anne E. Magurran, Measuring Biological Diversity, p. 173) Greetings from Germany, too.

201.25.251.153 (talk) 18:07, 5 January 2008 (UTC)[reply]

Something is wrong - currently, with the 2, it is exactly the same as Dice's coeff. I suggested the 2 is in fact dice's coefficient which people confuse with Sørensen similarity index dues to dice's coefficient making more sense. —Preceding unsigned comment added by 192.150.10.200 (talk) 21:45, 26 September 2008 (UTC)[reply]

Proposed Merge

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This is identical to Dice's coefficient. I think the two articles should be merged, but I don't know what would be the best name for the merged article. The formula is sometimes called the Sørensen-Dice coefficent. Maghnus (talk) 19:51, 31 August 2011 (UTC)[reply]

Agreed on the merge -- the present situation is just confusing. I'd call the combined page Sørensen-Dice coefficent and have all necessary redirects -- i.e. "Sørensen similarity index", "Dice coefficient", maybe "Sørensen distance" as I have also seen this.

Also the link to an (unwritten) article "Czekanowski similarity index" at the bottom -- it's just not different enough, is it? I think it should be included in this article. Octopod (talk) 19:14, 26 March 2012 (UTC)Octopod[reply]

I believe this was a misleading merge, as the two coefficients differ by a factor of 2, and it serves to confuse terminology. Comparisons of these coefficients across research requires one to know whether the factor of 2 is present or not. Cross linking the two articles would've been preferable.
At the very least, the merged article should have been called the Dice-Sørensen coefficient, since Dice is both first alphabetically and published it 3 years earlier. Unfortunately, this merge seems to have single-handedly seeded the new incorrect terminology on the internet. Qjkx (talk) 13:44, 11 May 2024 (UTC)[reply]