PiscesLogoSmallerStill  McQuitty's

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Let Dkl = any distance or dissimilarity measure between clusters Ck and Cl. If clusters Ck and Cl are merged to form Cm, the formula giving the distance between the new cluster Cm and any other cluster Cj is:

 

Djm = (Djk + Djl)/2 .

 

The method was independently developed by Sokal and Michener (1958) and McQuitty (1966).