Weighting coefficients for the estimation of sensory threshold
- 1 March 1978
- journal article
- research article
- Published by Oxford University Press (OUP) in Chemical Senses
- Vol. 3 (1) , 105-121
- https://doi.org/10.1093/chemse/3.1.105
Abstract
This paper discusses the determ-nation of difference thresholds (ED50) by least squares procedures. A table of weights (W) to correct ED50 for chance probability was constructed for paired and triangle designs. The probability (P) of a correct judgment above chance for the paired design is P = 2p*−1, where p* is the actual proportion of correct responses. For the triangle design, P = (3p*−l)/2. In both designs, P was weighted by W = y2/p*q*, where y2 is the squared ordinate of the normal curve based on P, and q* = 1−p*. An example of the use of the table of weights is provided.Keywords
This publication has 0 references indexed in Scilit: