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On a New Approach to the Analysis of Variance for Experiments with Orthogonal Block Structure.

100%
Calinski T., Siatkowski I.
Biometrical Letters
|
2017
|
tom 54
|
nr 2
91-122
EN
Summary The main estimation and hypothesis testing results are presented for experiments conducted in proper block designs. It is shown that, under appropriate randomization, these experiments have the convenient orthogonal block structure. Because of this, the analysis of experimental data can be performed in a comparatively simple way. Certain simplifying procedures are introduced. The main advantage of the presented methodology concerns the analysis of variance and related hypothesis testing procedures. Under the adopted approach one can perform them directly, not by combining results from intra-block and inter-block analyses. Application of the theory is illustrated by three examples of real experiments in proper block designs. This is the first of a projected series of papers concerning the analysis of experiments with orthogonal block structure.
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A note on the comparison of mixed-effects models for longitudinal studies

81%
Szabelska-Beręsewicz A., Bilska A., Waszkowiak K., Siatkowski I.
Biometrical Letters
|
2016
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tom 53
|
nr 2
165-173
EN
This paper concerns methods of choosing appropriate models for longitudinal studies. Attention is paid to three criteria: the marginal Akaike Information Criterion (mAIC), the conditional Akaike Information Criterion (cAIC), and the corrected conditional Akaike Information Criterion (ccAIC). We consider these criteria based on an example concerning the effect of storage time and addition of flaxseed (Linum usitatissimum L.) preparations (i.e. ground flaxseeds, defatted flaxseed meal and flaxseed ethanolic extract) on changes in lipid oxidation and fatty acid composition during the storage of liver pâté with partial substitution of fat with flax oil.
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The evaluation of gestation length range for different breeds of Polish dairy cattle

81%
Sobek Z., Nienartowicz-Zdrojewska A., Różańska-Zawieja J., Siatkowski I.
Biometrical Letters
|
2015
|
tom 52
|
nr 1
37-45
EN
For over 2.5 million dairy cows subject to assessment in Poland in 2005–2010, gestation length was analyzed. This trait follows a normal distribution, and it was found that the acceptable upper limit of gestation length for the Montbéliard and Simental breeds was 306 days, this being significantly different from other breeds. For the remaining dairy cattle breeds the value was 298 days. For cows with gestation length exceeding these limiting values, parentage control would be advisable.
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