Judi Lapsley Miller
25 August 1995
Psychology Department Research Seminar
Abstract
The results of all psychological experiments are noise degraded. In
psychophysical experiments this noise degradation can be modeled as coming from
two types of noise sources: unique noise sources and common noise sources. One
source of common noise is caused by the size of the stimulus set. If the
stimulus set is too small then the variability in measures of sensitivity may be
so great as to render any inference useless. This seminar will look at the
results of a computer simulation of common noise sampling variability. The
simulation estimates the amount of variability in measures of sensitivity as a
function of the number of stimuli. This allows estimation of the number of
stimuli for a real stimulus set.
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