Sökning: "Bayesian clustering"

Visar resultat 1 - 5 av 20 avhandlingar innehållade orden Bayesian clustering.

  1. 1. Bayesian Cluster Analysis : Some Extensions to Non-standard Situations

    Författare :Jessica Franzén; Daniel Thorburn; Jukka Corander; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Cluster analysis; Clustering; Classification; Mixture model; Gaussian; Bayesian inference; MCMC; Gibbs sampler; Deviant group; Longitudinal; Missing data; Multiple imputation; Statistics; Statistik; Statistics; statistik;

    Sammanfattning : The Bayesian approach to cluster analysis is presented. We assume that all data stem from a finite mixture model, where each component corresponds to one cluster and is given by a multivariate normal distribution with unknown mean and variance. LÄS MER

  3. 2. Physics-informed inferences of galaxy clustering with Bayesian forward modelling

    Författare :Eleni Tsaprazi; Jens Jasche; Ariel Goobar; Alkistis Pourtsidou; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; large-scale structure; galaxy clustering; supernovae; Bayesian statistics; Physics; fysik;

    Sammanfattning : In this thesis, we showcase four novel approaches to constraining the relationship between cosmological observables and the large-scale structure. The majority of the energy content of the Universe in the concordance cosmological model remains largely unknown. LÄS MER

  4. 3. Bayesian Modeling of Directional Data with Acoustic and Other Applications

    Författare :Jalil Taghia; Arne Leijon; W. Bastiaan Kleijn; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Directional statistics; directional distributions; axial distributions; von Mises-Fisher distribution; complex Watson distribution; complex Bingham distribution; Bayesian inference; probabilistic modeling; variational inference; two-dimensional hidden Markov models; Markov chain; blind source separation; frequency domain BSS; underdetermined BSS; online BSS; Bayesian recursive; gene expression data; gene-microarray data; line spectral frequency; speaker identification. ii;

    Sammanfattning : A direction is defined here as a multi-dimensional unit vector. Such unitvectors form directional data. Closely related to directional data are axialdata for which each direction is equivalent to the opposite direction.Directional data and axial data arise in various fields of science. LÄS MER

  5. 4. Approximations of Bayes Classifiers for Statistical Learning of Clusters

    Författare :Magnus Ekdahl; Timo Koski; Jukka Corander; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Pattern Recognition; Stochastic Complexity; Naïve Bayes; Bayesian Network; Classification; Clustering; Chow-Liu trees; Mathematical statistics; Matematisk statistik;

    Sammanfattning : It is rarely possible to use an optimal classifier. Often the classifier used for a specific problem is an approximation of the optimal classifier. Methods are presented for evaluating the performance of an approximation in the model class of Bayesian Networks. LÄS MER

  7. 5. Statistical and machine learning methods to analyze large-scale mass spectrometry data

    Författare :Matthew The; Lukas Käll; Oliver Kohlbacher; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; mass spectrometry - LC-MS MS; statistical analysis; data processing and analysis; protein inference; large-scale studies; simulation; protein quantification; clustering; machine learning; Bayesian statistics; Bioteknologi; Biotechnology;

    Sammanfattning : Modern biology is faced with vast amounts of data that contain valuable information yet to be extracted. Proteomics, the study of proteins, has repositories with thousands of mass spectrometry experiments. These data gold mines could further our knowledge of proteins as the main actors in cell processes and signaling. LÄS MER