Agriculture, Vol. 21 No. 2, 2015.
Original scientific paper
https://doi.org/10.18047/poljo.21.2.8
PEARSON'S OR SPEARMAN'S CORRELATION COEFFICIENT - WHICH ONE TO USE?
Andrijana Rebekić
orcid.org/0000-0003-1291-4769
; J.J.Strossmayer University of Osijek, Faculty of Agriculture in Osijek, Kralja Petra Svačića 1d, 31000 Osijek, Croatia
Zdenko Lončarić
orcid.org/0000-0003-4927-3969
; J.J.Strossmayer University of Osijek, Faculty of Agriculture in Osijek, K. P. Svačića 1d, 31000 Osijek, Croatia
Sonja Petrović
; J.J.Strossmayer University of Osijek, Faculty of Agriculture in Osijek, K. P. Svačića 1d, 31000 Osijek, Croatia
Sonja Marić
; J.J.Strossmayer University of Osijek, Faculty of Agriculture in Osijek, K. P. Svačića 1d, 31000 Osijek, Croatia
Abstract
Mosf commonly used correlation coefficients are Pearson's product moment correlation coefficient and Spearman's rank correlation coefficient. The aim of this paper is to compare a Pearson's and Spearman's coefficient of correlation on the same data set. The winter wheat grain cadmium (Cd) concentration was correlated to grain zinc (Zn) concentration, plant height, plant weight, number of spikelets per spike and 1000 kernel weight. Data were collected from the experiment carried out in semi controlled conditions, where genotypic specificity of winter wheat varieties was tested on the grain Cd and Zn accumulation on uncontaminated and Cd contaminated soil. Results showed that selection of most convenient correlation coefficient mostly depends on the type of variables, presence of outliers normality and linearity of relationship.
Keywords
linear relationship; outliers; log 10 transformation; frequency distribution; winter wheat
Hrčak ID:
150615
URI
Publication date:
18.12.2015.
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