Vol: 42 Page: 25

Authors:
Bogna Zawieja
Wiesław Pilarczyk

Title:
 Comparison of four methods of testing varietal uniformity in DUS trials

Language: English

Keywords:
Bennett's method
coefficient of variation
COYU method
Miller method
oilseed rape
simulation
test F
variety uniformity

Summary:
In the paper the four methods of testing uniformity of varieties of oil-seed rape are compared (combining over-years uniformity – COYU, the Bennett’s method, the F-test and the Miller test). Partly real and partly simulated data were used. The different measures of agreement (Pz, Cohen kappa and odds ratio OR) showed high similarity of decisions between methods. Nevertheless for oil-seed rape data the most lenient (the highest number of varieties declared uniform) was the COYU method, the most restrictive was the Miller method.

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