Search for dissertations about: "Multinomial distribution"

Showing result 1 - 5 of 7 swedish dissertations containing the words Multinomial distribution.

2. 1. Structural Models of Network Contacts Between Actors Governed by Activity and Attraction

   Author : Zhi Geng; Statistiska institutionen; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Directed graph; Ego-nets; EM algorithm; Gibbs sampling; Multinomial distribution; Hypergeometric distribution; Vertex covariates; Clustering coefficient; Taylor expansion;

   Abstract : This thesis consists of five papers on the subject of statistical modeling of stochastic networks. The NG-model proposed in Paper I combines a block structure with parameters that capture the identities of vertices and thus the new approach stresses the concept of ego-nets, which describes the structure around identified vertices. READ MORE

4. 2. Income Generation in the African and Coloured Population: Three essays on the origins of household incomes in South Africa

   Author : Sten Dieden; Göteborgs universitet; []
   Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Africa; South Africa; household incomes; income sources; inequality; labour; unemployment; core; periphery; multinomial logit; endogeneity;

   Abstract : The dissertation comprises three empirical analyses focusing on the origins of South African households? income sources. The income sources are categorized to reflect the households? varying extent of economic core sector integration. READ MORE

5. 3. Estimation of wood fibre length distributions from censored mixture data

   Author : Ingrid Svensson; Sara Sjöstedt - de Luna; Lennart Bondesson; Aila Särkkä; Umeå universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; censoring; fibre length distribution; identifiability; increment core; length bias; mixture; stochastic EM algorithm; Mathematical statistics; Matematisk statistik;

   Abstract : The motivating forestry background for this thesis is the need for fast, non-destructive, and cost-efficient methods to estimate fibre length distributions in standing trees in order to evaluate the effect of silvicultural methods and breeding programs on fibre length. The usage of increment cores is a commonly used non-destructive sampling method in forestry. READ MORE

6. 4. On Methods for Real Time Sampling and Distributions in Sampling

   Author : Kadri Meister; Daniel Thorburn; Umeå universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Mathematical statistics; Finite population sampling; inferential issues; real time sampling; sequential sampling methods; negative sampling correlations; model-design-based inference; multivariate Bernoulli and multinomial designs; Matematisk statistik; Mathematical statistics; Matematisk statistik; Mathematical Statistics; matematisk statistik;

   Abstract : This thesis is composed of six papers, all dealing with the issue of sampling from a finite population. We consider two different topics: real time sampling and distributions in sampling. The main focus is on Papers A–C, where a somewhat special sampling situation referred to as real time sampling is studied. READ MORE

7. 5. On Bayesian graphical model determination

   Author : Jukka Corander; Carlo Berzuini; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Bayesian inference; Entropy; Exponential models; Graphical models; Logarithmic utility; Statistics; Statistik; statistik; Statistics;

   Abstract : A graphical model specifies a graph representation of the independence structure of a multivariate distribution, where nodes represent variables and edges association between variables.This thesis introduces methodology for determination of graphical models for multivariate distributions within the exponential family. READ MORE