Search results for: Marcin Przystalski

Items from 1 to 11 out of 11 results

article

Comparing the soybeans (Glycine max) vegetation length in the Polish official variety trials

Agnieszka Osiecka, Marcin Przystalski

One of the best methods to achieve soybean cultivation success is to cultivate varieties with proper vegetation length. In the present work, vegetation length from a Polish soybean series of field trials conducted in years 2017–2020 was analysed using a generalized linear mixed model. It is shown that the tested varieties differ in terms of the vegetation length. In the analysed series of field trials...

article

Comparing the resistance of mid‐maturing maize varieties to European corn borer (Ostrinia nubilalis Hbn.)—results from the Polish VCU registration field trials

Marcin Przystalski, Tomasz Lenartowicz, H.‐P. Piepho

Plant Breeding > 136 > 4 > 498 - 508

European corn borer is a major pest in the United States and Europe. This pest causes grain yield losses worth billions of Dollars. One of the best methods to control this pest making damages is cultivation of resistant varieties. In the present work, using the generalized linear mixed model methodology, we identified maize varieties with improved resistance to European corn borer from a Polish VCU...

article

Hypothesis testing in unbalanced two-fold nested random models

Marcin Przystalski

Applicationes Mathematicae > 2016 > 43 > 1 > 57-78

In many applications of linear random models to multilevel data, it is of interest to test whether the random effects variance components are zero. In this paper we propose approximate tests for testing significance of variance components in the unbalanced two-fold nested random model in the presence of non-normality. In the derivations of the asymptotic distributions of the test statistics, as an...

article

Estimation of the covariance matrix in multivariate partially linear models

Marcin Przystalski

Journal of Multivariate Analysis > 2014 > 123 > Complete > 380-385

Multivariate partially linear models are generalizations of univariate partially linear models. In the literature, some estimators of treatment effects and nonparametric components have been proposed. In this note, the estimator of the covariance matrix in multivariate partially linear models is derived and some of its properties are given.

article

A method for identifying oat varieties with improved resistance to oat crown rust from a series of field trials

Marcin Przystalski, Piotr Tokarski, Wiesław Pilarczyk

Field Crops Research > 2013 > 149 > Complete > 49-55

Oat crown rust is a fungal disease caused by pathogen Puccinia coronata f. sp. avenae. Crown rust reduces oat yield and causes thin kernels with low weight. In Polish trials on spring oat one of the compulsory observed characteristics is resistance to oat crown rust. In the present work, the generalized linear mixed model with several variance components is applied to model the resistance to oat crown...

article

Hypothesis testing in multivariate partially linear models

Marcin Przystalski

Comptes rendus - Mathematique > 2010 > 348 > 3-4 > 207-210

Multivariate partially linear models are generalizations of univariate partially linear models. In the literature, some methods of estimation of parametric and nonparametric component have been proposed. In this Note we focus on hypothesis testing of treatment effects in multivariate partially linear models. We construct a procedure for testing hypothesis H0: CBM=0.

article

A note on q-weak law of large numbers

Marcin Przystalski

Physics Letters A > 2009 > 374 > 2 > 123-125

q-limit theorems for random variables are arising from non-extensive statistical mechanics. In this note we will prove q-weak law of large numbers using the notions of q-Fourier transform, q-independence, q-weak convergence.

article

Asymptotics for Products of a Random Number of Partial Sums

Marcin Przystalski

Bulletin of the Polish Academy of Sciences. Mathematics > 2009 > 57 > 2 > 163-167

We consider products of a random number of partial sums of independent, identically distributed, positive square-integrable random variables. We show that the distribution of these products is asymptotically lognormal.

article

Differential metabolic response of narrow leafed lupine (Lupinus angustifolius) leaves to infection with Colletotrichum lupini

Dorota Muth, Piotr Kachlicki, Paweł Krajewski, Marcin Przystalski, more

Metabolomics > 2009 > 5 > 3 > 354-362

Flavones and isoflavones are a major group of phenolic secondary metabolites which occur in leaves of narrow leafed lupine (Lupinus angustifolius) either as free aglycones or in a form of glycosides and malonyl-glycosides. Profiles of phenolic compounds in leaves of seedlings infected with anthracnose causing fungus Colletotrichum lupini were compared to those of healthy plants. A HPLC with diode...

article

Erratum to “Constrained estimators of treatment parameters in semiparametric models” [Statist. Probab. Lett. 77 (2007) 914–919]

Marcin Przystalski, Paweł Krajewski

Statistics and Probability Letters > 2008 > 78 > 9 > 1158-1159

In [Przystalski M., Krajewski P., 2007. Constrained estimators of treatment parameters in semiparametric models. Statist. Probab. Lett. 77, 914–919] we presented a method of estimation of treatment effects in a semiparametric model with one smoothing term under additional conditions on their linear functions and its application to hypothesis testing. In this note we will present the corrected version...

article

Constrained estimators of treatment parameters in semiparametric models

Marcin Przystalski, Paweł Krajewski

Statistics and Probability Letters > 2007 > 77 > 9 > 914-919

Semiparametric models are generalizations of parametric regression models. We present a method of estimation of treatment effects in a semiparametric model with one smoothing term under additional conditions on their linear functions and its application to hypothesis testing.

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