The application of orthogonal contrasts to determine homogeneous groups

Zbigniew Laudański


Plant Breeding and Acclimatization Institute — National Research Institute in Radzików, Poland (Poland)

Dariusz Mańkowski

d.mankowski@ihar.edu.pl
Plant Breeding and Acclimatization Institute - National Research Institute (Poland)
https://orcid.org/0000-0002-7499-8016

Leszek Sieczko


Institute of Agriculture — Warsaw University of Life Sciences, Poland (Poland)

Monika Janaszek-Mańkowska


Institute of Mechanical Engineering — Warsaw University of Life Sciences, Poland (Poland)

Abstract

The paper presents a modified approach to analysis of data obtained from experiments carried out according to classical factorial designs. Four examples were discussed in order to present details of proposed method. Modification of the analysis of variance presented here enables more effective use of information on how studied factors affect the means of dependent variable. The specificity of this approach is based on alternative multiple comparison procedure incorporating orthogonal contrasts to determine homogeneous groups.


Keywords:

experiment, data analysis, linear model, ANOVA, multiple comparisons, orthogonal contrasts

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Published
2021-12-02

Cited by

Laudański, Z., Mańkowski, D., Sieczko, L., & Janaszek-Mańkowska, M. (2021). The application of orthogonal contrasts to determine homogeneous groups. Plant Breeding and Seed Science, 82, 31–44. https://doi.org/10.37317/pbss-2021-0003

Authors

Zbigniew Laudański 

Plant Breeding and Acclimatization Institute — National Research Institute in Radzików, Poland Poland

Authors

Dariusz Mańkowski 
d.mankowski@ihar.edu.pl
Plant Breeding and Acclimatization Institute - National Research Institute Poland
https://orcid.org/0000-0002-7499-8016

Authors

Leszek Sieczko 

Institute of Agriculture — Warsaw University of Life Sciences, Poland Poland

Authors

Monika Janaszek-Mańkowska 

Institute of Mechanical Engineering — Warsaw University of Life Sciences, Poland Poland

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