Document Detail

A comparison of correlation, calibration, and diagnosticity as measures of the confidence-accuracy relationship in witness identification.
MedLine Citation:
PMID:  10948795     Owner:  NLM     Status:  MEDLINE    
The relationship between witness confidence and accuracy (CA) has traditionally been measured by the point-biserial correlation (rpb). Recently, 2 alternative indices for measuring the CA relation have been proposed, namely calibration and diagnosticity analyses (e.g., P. Juslin, N. Olsson, & A. Winman, 1996). In this study, the 3 measures were compared quantitatively using 52 independent data sets. The measures rpb and calibration were weakly correlated, whether computed across earwitness data sets, eyewitness data sets, or all data. Thus, when applied to the same data, these 2 measures sometimes yield different conclusions. A modest relation was observed between the rpb and the diagnosticity of confidence. Finally, calibration and degree of over- and underconfidence covaried with task difficulty, consistent with K. A. Deffenbachers' (1980) optimality hypothesis.
N Olsson
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of applied psychology     Volume:  85     ISSN:  0021-9010     ISO Abbreviation:  J Appl Psychol     Publication Date:  2000 Aug 
Date Detail:
Created Date:  2000-09-26     Completed Date:  2000-09-26     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0222526     Medline TA:  J Appl Psychol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  504-11     Citation Subset:  IM    
Department of Psychology, Uppsala University, Sweden.
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