Sökning: "missing samples"
Visar resultat 1 - 5 av 49 avhandlingar innehållade orden missing samples.
1. Two Topics in Survey Methodology : Inference from Nonprobability Samples Using the Double Samples SetupDetta är en avhandling från Stockholm : Statistiska institutionen
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
- Detta är en avhandling från Stockholm : Department of Mathematics, Stockholm University
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
- Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis
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
- Detta är en avhandling från Stockholm : Department of Environmental Science and Analytical Chemistry, Stockholm University
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
- Detta är en avhandling från Stockholm : Karolinska Institutet, Department of Medical Epidemiology and Biostatistics
Sammanfattning : Studies of familial aggregation of disease routinely use linked population registers to construct retrospective cohorts. Although such resources have provided numerous estimates of familial risk, little is known regarding the sensitivity of the estimates to assumed disease models and incompleteness of the data, such as truncation and/or missing family links. LÄS MER