Browsing by Subject "non-parametric statistical methods"

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Access status: Open Access ,
Ocena zawartości popiołu w pokładach węgla za pomocą nieparametrycznych metod statystycznych
(2007) Niedoba, Tomasz
The paper presents the distribution of ash contents in coal, treated as the mixture of distributions taken from the individual coal beds. In purpose of their approximation, apart from traditional log-norm distribution function, the non-parametric statistical methods were applied: kernel method and orthogonal Fourier series method. The best results of approximation were then mixed and the risk probability of evaluating the ash contents in the whole deposit was estimated.
Access status: Open Access ,
Wielowymiarowe rozkłady charakterystyk materiałów uziarnionych przy zastosowaniu nieparametrycznych aproksymacji funkcji gęstości rozkładów brzegowych
(Wydawnictwa AGH, 2009) Niedoba, Tomasz
Estimations of individual grained materials characteristics distribution functions is usually done separately. The method of Morgenstern, applied in the paper allows searching for multidimensional distribution function, taking into consideration at least two features simultaneously. The estimation of particles size and their density was performed on the basis of coal from KWK »Piast«. In the purpose of so-called marginal distribution functions estimation the non-parametric statistical methods were applied - Gauss kernel method and orthogonal Fourier series method. The results were statistically evaluated what confirmed the adequacy of the method.