The dependence of DUS (distinctness, uniformity and stability) decisions concerning white mustard and oilseed rape varieties on the number of measurements
An analysis is made of the possibility of reducing numbers of measurements in DUS (distinctness, uniformity and stability) trials on varieties of white mustard and oilseed rape, based on the results of DUS trials performed in the years 2005–2009 by the Research Centre for Cultivar Testing. It is shown that, when decisions are taken after three years of testing, it is possible to decrease the number of measurements by 50%, with the decisions practically unchanged for both considered species. For so-called early decisions (after two years of testing) the distinctness decisions are again practically the same for full and reduced data, although the decisions concerning uniformity differ significantly. This means that the number of measurements can be reduced only in cases where DUS testing is continued for three years.
- Department of Mathematical and Statistical Methods, Poznan University of Life Sciences, Wojska Polskiego 28, 60-637 Poznań, Poland, firstname.lastname@example.org
- The Research Centre for Cultivar Testing at Słupia Wielka, Słupia Wielka 63-022, Poland, email@example.com
- Department of Mathematical and Statistical Methods, Poznan University of Life Sciences, Wojska Polskiego 28, 60-637 Poznań, Poland, firstname.lastname@example.org
- Kunde H.L., Polansky M. (2003): Measurement of observer agreement. Radiology 228: 303-308.
- Landis J.R., Koch G.G. (1977): The measurement of observer agreement for categorical data. Biometrics 33: 159-174.
- Pilarczyk W., Kowalczyk B. (2011): The influence of reduction of the number of measurements on decisions concerning distinctness of perennial ryegrass varieties. Biometrical Letters 48(2): 149-157.
- Pilarczyk W., Kowalczyk B. (2012): The influence of reduction in measured plant number on distinctness of amenity varieties of perennial ryegrass (Lollium Perenne L.) tested in DUS trials. Colloquium Biometricum 42: 35-42.
- Pilarczyk W., Kowalczyk B. (2014): The influence of reduction of the number of measurements on decisions concerning distinctness of red fescue varieties. Colloquium Biometricum 44: 79-88.
- Pilarczyk W., Kowalczyk B., Bakinowska E. (2015): Comparison of uniformity decisions in DUS testing for full and reduced numbers of measurements. Biometrical Letters 52(1): 45-53.
- Roberts A. (2011): Cyclic planting of established varieties to reduce trial size. TWC/29/26. UPOV Geneva.
- Talbot M. (2000): The Combined-Over-Years Distinctness and Uniformity criteria. TWC/18/10. UPOV Geneva.
- TG/36/6 (2002): Guidelines for the conduct of tests for distinctness, uniformity and stability for Rape Seed. UPOV Geneva.
- TG/179/3 (2001): Guidelines for the conduct of tests for distinctness, uniformity and stability for White Mustard. UPOV Geneva.
- Watson S. (2000): DUST for Widows (DUSTNT). TWC/18/13. UPOV Geneva.