The transformation of local lesion counts for statistical analysis

A - Papers appearing in refereed journals

Kleczkowski, A. 1949. The transformation of local lesion counts for statistical analysis. Annals of Applied Biology - AAB. 36 (1), pp. 129-152.

AuthorsKleczkowski, A.

An analysis of the frequency distribution of local lesions, produced by viruses on half‐leaves of a number of plants, shows that their standard error increases with increasing mean. Hence analysis of variance and statistical tests of significance should not be applied to lesion numbers unless they are suitably transformed. The transformation into logarithms over‐corrects so that the standard error decreases with increasing mean. A satisfactory transformation is y= log10 (x+c), where x is the number of lesions and c is a constant. A method is given of assessing c for different experiments. Great accuracy is not needed; in an experiment discussed in detail a satisfactory transformation is obtained with any value for c between 15 and 80.

On individual plants the numbers of lesions formed on half‐leaves are distributed more or less normally, whereas their distribution about the common mean for many plants is skew and ‘leptokurtic’. The distribution of the transformed numbers is almost normal, both for individual plants and about the common mean for a number of plants.

Year of Publication1949
JournalAnnals of Applied Biology - AAB
Journal citation36 (1), pp. 129-152
Digital Object Identifier (DOI)doi:10.1111/j.1744-7348.1949.tb06404.x
PubMed ID18116927
Open accessPublished as non-open access
Output statusPublished
Publication dates
Print01 Mar 1949

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