COMPARISON OF SIGMPLOT, PROBIT, AND EXTREME-VALUE METHODS FOR THE ANALYSIS OF THRESHOLD DATA

1 October 1976

journal article
Published by Oxford University Press (OUP) in Chemical Senses

Vol. 2 (2) , 241-253
https://doi.org/10.1093/chemse/2.2.241

Abstract

Two panels consisting of 12 and of 14 members, respectively, evaluated solutions of ethyl caprylate at different concentrations to establish flavor detection thresholds. The resulting frequencies of success at each concentration level were analyzed by a probit method and Drake's procedure (1975). These two methods in turn were compared with extreme-value analysis. Agreement among the three methods was good. The lowest threshold observed was 0.00069 ppm and the highest, 26.9 ppm. An extreme-value plot is presented for 59 determinations obtained in prior studies and the 26 values of this study. The limitations and advantages of each method of calculation are discussed as are precautions relative to the way the extreme-value data should be accumulated or arrayed for analysis.

Keywords

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