Re: identification task...negative d' values. (Daniel Oberfeld )

Subject: Re: identification task...negative d' values.
From:    Daniel Oberfeld  <oberfeld@xxxxxxxx>
Date:    Wed, 3 May 2006 09:41:05 +0200

Note that you could test if an *individual* d' value (that is, d' 
observed for a given observer in a given condition) significantly 
differs from 0 using a test described by

Gourevitch, V., & Galanter, E. (1967). A significance test for one 
parameter isosensitivity functions. Psychometrika, 32, 25-33.

(cf. also Marascuilo, L. A. (1970). Extensions of the significance test 
for one-parameter signal detection hypotheses. Psychometrika, 35, 237–243.)

The test is not very powerful however, so that interpretation of the 
results should be taken with caution unless you have more than, say, 300 
observations per data point.

Daniel


---------------------------
Dr. Daniel Oberfeld-Twistel
Universität Mainz
Institute of Psychology
Experimental Psychology

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