THE RETENTION INDEX AND THE RESCALED CONSISTENCY INDEX

THE RETENTION INDEX AND THE RESCALED CONSISTENCY INDEX I 1)epartrnent o f Ecology and Euolution, State Unioersity o j ' . , V e a York, S t o y Brook, ,jVl' I I B 4 , C!.S.A. and Department ofEntornology, American ;Mu.reurn of'JVatura1 Hi.stoy, C'entrul Park M Z s t at 79th Street, h e m York, N Y 10024, U.S.A. and Ilefiartmenl aJ Biolog, CiQ College, Cip IJnirw~ityof',Vew York, CJ.S.A. T h c consistency index, introduced by Kluge and Farris (1969) as a measure ol'6t o f a character to a tree, has been widely and successfully employed, but might be capable of some improvement for certain applications. 'The purpose of this note is to dcwrihe two new indices, already in use in Hennig86, and to explain their interpretation. T h e consistency index, c, is defined t o be c = rnls. Irere s denotes thr amount of change in the character (for an integral character, number of' steps) required parsimoniously by the considered tree, and rn represents the minimum amount ofchange that the character may show on any trct'. Both .f and ni depeiid o n the suite of' terminals used, for which reason it is assumed throughout that some particular set http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Cladistics Wiley

THE RETENTION INDEX AND THE RESCALED CONSISTENCY INDEX

Cladistics, Volume 5 (4) – Dec 1, 1989

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Publisher
Wiley
Copyright
© 1989 The Willi Hennig Society
ISSN
0748-3007
eISSN
1096-0031
DOI
10.1111/j.1096-0031.1989.tb00573.x
Publisher site
See Article on Publisher Site

Abstract

I 1)epartrnent o f Ecology and Euolution, State Unioersity o j ' . , V e a York, S t o y Brook, ,jVl' I I B 4 , C!.S.A. and Department ofEntornology, American ;Mu.reurn of'JVatura1 Hi.stoy, C'entrul Park M Z s t at 79th Street, h e m York, N Y 10024, U.S.A. and Ilefiartmenl aJ Biolog, CiQ College, Cip IJnirw~ityof',Vew York, CJ.S.A. T h c consistency index, introduced by Kluge and Farris (1969) as a measure ol'6t o f a character to a tree, has been widely and successfully employed, but might be capable of some improvement for certain applications. 'The purpose of this note is to dcwrihe two new indices, already in use in Hennig86, and to explain their interpretation. T h e consistency index, c, is defined t o be c = rnls. Irere s denotes thr amount of change in the character (for an integral character, number of' steps) required parsimoniously by the considered tree, and rn represents the minimum amount ofchange that the character may show on any trct'. Both .f and ni depeiid o n the suite of' terminals used, for which reason it is assumed throughout that some particular set

Journal

CladisticsWiley

Published: Dec 1, 1989

References

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