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SPSS® 12.0 Command Syntax Reference

SPSS® 12.0 Command Syntax Reference

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232 CLUSTER<br />

and all except two (K1 and SS3) range from 0 to 1. K1 and SS3 have a minimum value of 0<br />

and no upper limit.<br />

Table 1 Binary matching coefficients in CLUSTER<br />

All matches included<br />

in denominator<br />

Equal weight for<br />

matches and nonmatches<br />

Double weight for<br />

matches<br />

Double weight for<br />

nonmatches<br />

Joint absences excluded<br />

from denominator<br />

Equal weight for<br />

matches and nonmatches<br />

Double weight for<br />

matches<br />

Double weight for<br />

nonmatches<br />

All matches excluded<br />

from denominator<br />

Equal weight for<br />

matches and nonmatches<br />

Joint absences<br />

excluded from<br />

numerator<br />

Joint absences<br />

included in<br />

numerator<br />

RR SM<br />

JACCARD<br />

DICE<br />

SS2<br />

RR[(p[,np])] Russell and Rao similarity measure. This is the binary dot product.<br />

RR( x, y)<br />

SM[(p[,np])] Simple matching similarity measure. This is the ratio of the number of<br />

matches to the total number of characteristics.<br />

SM( x, y)<br />

JACCARD[(p[,np])] Jaccard similarity measure. This is also known as the similarity ratio.<br />

JACCARD( x, y)<br />

SS1<br />

RT<br />

K1 SS3<br />

a<br />

= -----------------------------a<br />

+ b+ c + d<br />

a+ d<br />

= -----------------------------a<br />

+ b + c + d<br />

a<br />

=<br />

-------------------a<br />

+ b + c

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