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Random triangles
Matula, Dominik ; Anděl, Jiří (advisor) ; Dvořák, Jiří (referee)
The author summarizes some previous results concerning random triangles. He describes the Gaussian triangle and random triangles whose vertices lie in a unit n-dimensional ball, in a rectangle or in a general bounded convex set. In the second part, the author deals with an inscribed triangle in a triangle - let ABC be an equilateral triangle and let M, N, O be three points, each laying on one side of the ABC. We call MNO inscribed triangle (in an equi- laterral triangle). The median triangle is a special case of that triangle. Author starts with the median triangle and one by one replaces it's vertices by random points with uniform distribution on the corresponding sides. He proves that propability of such inscribed triangle to be an obtuse triangle increases with number of randomly chosen points while the expected area reminds constant. The whole thesis is concluded with a simulation study. 1
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Models for zero-inflated data
Matula, Dominik ; Kulich, Michal (advisor) ; Hlubinka, Daniel (referee)
The aim of this thesis is to provide a comprehensive overview of the main approaches to modeling data loaded with redundant zeros. There are three main subclasses of zero modified models (ZMM) described here - zero inflated models (the main focus lies on models of this subclass), zero truncated models and hurdle models. Models of each subclass are defined and then a construction of maximum likelihood estimates of regression coefficients is described. ZMM models are mostly based on Poisson or negative binomial type 2 distribution (NB2). In this work, author has extended the theory to ZIM models generally based on any discrete distributions of exponential type. There is described a construction of MLE of regression coefficients of theese models, too. Just few of present works are interested in ZIM models based on negative binomial type 1 distribution (NB1). This distribution is not of exponential type therefore a common method of MLE construction in ZIM models cannot be used here. In this work provides modification of this method using quasi-likelihood method. There are two simulation studies concluding the work. 1
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Random triangles
Matula, Dominik ; Anděl, Jiří (advisor) ; Dvořák, Jiří (referee)
The author summarizes some previous results concerning random triangles. He describes the Gaussian triangle and random triangles whose vertices lie in a unit n-dimensional ball, in a rectangle or in a general bounded convex set. In the second part, the author deals with an inscribed triangle in a triangle - let ABC be an equilateral triangle and let M, N, O be three points, each laying on one side of the ABC. We call MNO inscribed triangle (in an equi- laterral triangle). The median triangle is a special case of that triangle. Author starts with the median triangle and one by one replaces it's vertices by random points with uniform distribution on the corresponding sides. He proves that propability of such inscribed triangle to be an obtuse triangle increases with number of randomly chosen points while the expected area reminds constant. The whole thesis is concluded with a simulation study. 1
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