Document Detail

The maxslope taxometric procedure: mathematical derivation, parameter estimation, consistency tests.
MedLine Citation:
PMID:  15587219     Owner:  NLM     Status:  MEDLINE    
This article first explains concepts in taxometrics, including the meaning of "taxon" in relation to taxometric procedures. It then mathematically develops the MAXSLOPE procedure of Grove and Meehl which relies on nonlinear regression of one taxometric indicator variable on another. Sufficient conditions for MAXSLOPE's validity are set forth. The relationship between the point of maximum regression slope (MAXSLOPE point) and the HITMAX cut, i.e., the point on a variable which, if used as a diagnostic cut-off score, yields maximum classification accuracy, is analyzed. A sufficient condition is given for the MAXSLOPE point to equal the HITMAX cut; however, most distributions have different MAXSLOPE and HITMAX points. Equations and an algorithm are spelled out for making a graphical test for the existence of a taxon, estimating taxometric parameters, and conducting consistency tests; the latter serve as stringent checks on the validity of a taxonic conjecture. The plausibility of assumptions made, in deriving MAXSLOPE equations, is discussed, and the qualitative effects of violations of these assumptions are explained.
William M Grove
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Publication Detail:
Type:  Journal Article; Validation Studies    
Journal Detail:
Title:  Psychological reports     Volume:  95     ISSN:  0033-2941     ISO Abbreviation:  Psychol Rep     Publication Date:  2004 Oct 
Date Detail:
Created Date:  2004-12-10     Completed Date:  2005-01-04     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0376475     Medline TA:  Psychol Rep     Country:  United States    
Other Details:
Languages:  eng     Pagination:  517-50     Citation Subset:  IM    
Department of Psychology, University of Minnesota, Twin Cities, 55455-0344, USA.
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MeSH Terms
Classification / methods*
Models, Theoretical*
Psychology / methods,  statistics & numerical data
Reproducibility of Results

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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