International
Tables for
Crystallography
Volume H
Powder diffraction
Edited by C. J. Gilmore, J. A. Kaduk and H. Schenk

International Tables for Crystallography (2018). Vol. H, ch. 3.8, p. 327

Table 3.8.1 

C. J. Gilmore,a G. Barra and W. Donga*

aDepartment of Chemistry, University of Glasgow, University Avenue, Glasgow, G12 8QQ, UK
Correspondence e-mail:  chris@chem.gla.ac.uk

Table 3.8.1| top | pdf |
Six commonly used clustering methods

For each method, the coefficients αi, β and γ in equation (3.8.11)[link] are given.

Methodαiβγ
Single link ½ 0 −½
Complete link ½ 0 ½
Average link ni/(ni + nj) 0 0
Weighted-average link ½ 0 0
Centroid ni/(ni + nj) ninj/(ni + nj)2 0
Sum of squares (ni + nk)/(ni + nj + nk) nk/(ni + nj + nk) 0