PSYCHOPHYSICAL METHODOLOGY II. COMPARISON OF MEANS AND OF STANDARD DEVIATIONS OF THE ASCENDING AND DESCENDING METHOD OF LIMITS.
NAVAL AIR DEVELOPMENT CENTER JOHNSVILLE PA AEROSPACE MEDICAL RESEARCH DEPT
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Assume that the probability of a Yes response increases as the stimulus intensity increases. Then, on the basis of probability considerations alone a the mean threshold of the descending method of limits DML is greater than the mean threshold of the ascending method of limits AML and b sigma of the DML threshold distribution may be greater than, equal to, or less than sigma of the AML threshold distribution. Therefore, a the present method for evaluating errors of expectation and habituation is erroneous, b the just not noticeable difference jnnd should always be larger than the just noticeable difference jnd, c conclusions about relative precision based on a comparison of sigma s are wrong. Author
- Statistics and Probability