Sökning: "statistical techniques"

Visar resultat 21 - 25 av 441 avhandlingar innehållade orden statistical techniques.

1. 21. Statistical inference with deep latent variable models

   Författare :Najmeh Abiri; Beräkningsbiologi och biologisk fysik - Genomgår omorganisation; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Deep Learning; Generative Models; Variational Inference; Missing data; Imputation; Fysicumarkivet A:2019:Abiri;

   Sammanfattning : Finding a suitable way to represent information in a dataset is one of the fundamental problems in Artificial Intelligence. With limited labeled information, unsupervised learning algorithms help to discover useful representations. LÄS MER

3. 22. Environmental Monitoring by Multi-Spectral Lidar Techniques

   Författare :Petter Weibring; Atomfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; non-linear optics; fluorescence spectroscopy; scattering; multi-spectral imaging; Atom- och molekylärfysik; atmospheric pollution; Atomic and molecular physics; laser; remote sensing; lidar; DIAL; Fysicumarkivet A:2002:Weibring;

   Sammanfattning : Multi-spectral lidar (light detection and ranging) techniques have been developed and employed in various environmental studies, ranging from concentration mapping of volcanic emissions to fluorescence imaging of historical monuments. In both absorption measurements of gaseous species and fluorescence imaging of stones, multiple wavelength excitation and multiple wavelength detection have been applied. LÄS MER

4. 23. Epidemiology and statistical modeling in burn injuries

   Författare :Homayoun Sadeghi Bazargani; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :Burn injuries;

   Sammanfattning : An important issue in assessing the epidemiology of injuries, including burns, is the investigation of appropriate methodologies and statistical modeling techniques to study injuries in an efficient and trustworthy manner. The overall aim of this thesis is to analyze epidemiological patterns and assess the appropriateness of supervised statistical models to investigate burn risks and patterns. LÄS MER

5. 24. Economic Implications of Corporate Social Responsibility and Responsible Investments

   Författare :Cristiana Manescu; Göteborgs universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Corporate Social Responsibility; Strategic CSR; Socially Responsible Investments; Sustainability; Firm Profitability; Stock Returns; Statistical Learning Techniques; Variable Selection; Smooth Splines; Regression Trees; Data Envelopment Analysis; Difference-GMM; Risk-Factor Test; Market Efficiency; Control Functions Approach.;

   Sammanfattning : Paper 1 (with Catalin Starica): This study conducts an in-depth analysis of the association between a unique ten-dimensional set of Corporate Social Responsibility (CSR) scores and firm profitability, as measured by Return on Assets (ROA). We find that non-linear (semi or non-parametric) regression methods bring important improvements in explaining profitability relative to a classical linear approach. LÄS MER

7. 25. Statistical tools for ultrasonic analysis of dispersive fluids

   Författare :Jesper Martinsson; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Signalbehandling; Signal Processing;

   Sammanfattning : This thesis focuses on the possibility of using ultrasonic measurement techniques for energy gas characterization. The idea is to combine both on-line flow measurements with non-invasive fluid characterization in the same measurement setup using the same sensor(s). LÄS MER