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A technique for the comparison of treatments for control of scald on cool‐stored granny smith apples
Author(s) -
Coote G. G.,
Best D. J.
Publication year - 1973
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740240309
Subject(s) - sigmoid function , mathematics , statistics , regression , range (aeronautics) , linear regression , regression analysis , computer science , artificial intelligence , engineering , artificial neural network , aerospace engineering
This paper is based on a theoretical model for the progressive development of superficial scald on cool‐stored Granny Smith apples as an example of behaviour expected for physiological disease in fruits generally. Pilot units of fruit are used to detect onset of the disease and successive units are examined at empirically selected times to give data falling in an optimum range on a sigmoid‐type curve. This is done separately for each treatment so that the distribution of removal times is near to that giving the most efficient evaluation of the treatment. Transformations of response give linear changes on log (storage time), so that regression or covariance analysis permits the estimation of rates and adjusted mean values for the comparison of treatments for control of the disease. An important feature of the new technique is the determination of the times for the first and subsequent removals from storage sequentially to get an optimum arrangement of data for quantal regression estimation for each treatment; comparison of treatments is made by testing the regression lines for separation. The method is illustrated by analysis of experimental data.