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Visar resultat 1 - 5 av 66 avhandlingar som matchar ovanstående sökkriterier.
1. Two Topics in Survey Methodology : Inference from Nonprobability Samples Using the Double Samples Setup
Sammanfattning : Modelling the response process in establishment surveys proceeded thus far by adding steps of operational character to the core cognitive steps of the individual cognitive model. Here (Paper 1) a larger unit of the cognitive analysis is posited: that part of the enterprise that is engaged in responding to a survey, consisting of one or more employees, the tools they use and the established practices of record keeping and survey responding. LÄS MER
2. Design and analysis of response selective samples in observational studies
Sammanfattning : Outcome dependent sampling may increase efficiency in observational studies. It is however not always obvious how to sample efficiently, and how to analyze the resulting data without introducing bias. LÄS MER
3. Particle induced x-ray emission - analysis of biological samples
Sammanfattning : [abstract missing].... LÄS MER
4. Precise Image-Based Measurements through Irregular Sampling
Sammanfattning : Mathematical morphology is a theory that is applicable broadly in signal processing, but in this thesis we focus mainly on image data. Fundamental concepts of morphology include the structuring element and the four operators: dilation, erosion, closing, and opening. LÄS MER
5. Fluorine mass balance in wildlife and consumer products : How much organofluorine are we missing?
Sammanfattning : Per- and polyfluoroalkyl substances (PFASs) are a class of anthropogenic pollutants. Many PFASs are highly persistent and have been linked to adverse effects in humans. According to latest estimates, there are more than 4700 PFASs in global commerce, which poses immense challenges for environmental monitoring. LÄS MER