Sökning: "area variance"

Visar resultat 1 - 5 av 90 avhandlingar innehållade orden area variance.

  1. 1. Morphometry of the Optic Nerve Head as a Diagnostic Tool for Glaucoma

    Författare :Camilla Sandberg Melin; Per Söderberg; Boel Bengtsson; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; optic nerve head; ONH; nerve fibers; glaucoma; optical coherence tomography; OCT; Pigment epithelium central limit-inner limit of the retina minimal distance; PIMD; PIMD-2π; Segmental PIMD-2π; confocal scanning laser tomography; HRT; NRA; variation; variability; variance; loss rate; follow-up.;

    Sammanfattning : Glaucoma is a chronic optic nerve head (ONH) disease. Gradual retinal ganglion cell and nerve fiber loss lead to morphological ONH change and visual field defects. Initial loss is often focal. Rate of progression and life expectancy guide treatment. LÄS MER

  3. 2. Perinatal determinants of type 1 diabetes - A social epidemiological perspective

    Författare :Kristian Lynch; Celiaki och diabetes; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; area variance; multilevel modeling; contextual determinants; islet autoantibodies; type 1 diabetes; propensity score matching;

    Sammanfattning : Background and Aims: While the development of type 1 diabetes (T1D) in childhood is in part genetically conditioned, non-genetic/environmental factors seem to play a decisive role in its aetiology. The incidence of T1D has been increasing rapidly during the last years, and its prevalence is higher in countries of high economical welfare like Sweden. LÄS MER

  4. 3. Advanced Spectral Analysis with Applications

    Författare :Niclas Sandgren; Peter Stoica; Thomas L. Marzetta; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; frequency-selective spectral analysis; damped sinusoidal model; prior knowledge; multichannel spectroscopy; phantom experimental data; in-vivo in-vitro data analysis; area-selective analysis; cepstrum thresholding; total-variance reduction; two-dimensional spectral estimation; spectral smoothing; irregular sampling; CARMA signals; Signal processing; Signalbehandling;

    Sammanfattning : Spectral analysis has advanced the last decades as a signal processing tool to extract significant information about certain properties of measured data. The practical use of spectral analysis techniques in time-series analysis has been emphasized in the immense amount of previous literature in the field and by a rapidly growing number of applications. LÄS MER

  5. 4. On variance estimation for the two-phase regression estimator

    Författare :Martin Axelson; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Informatics; computer and systems science; Informatik; data- och systemvetenskap; Informatics; computer and systems science; Informatik; data- och systemvetenskap; statistik; Statistics;

    Sammanfattning : Regression estimation under two-phase sampling is a cost-effective technique for estimating a finite population total. This dissertation consists of four papers, summarized in an introductory chapter, all of which focus on the use of auxiliary information in estimating the variance of the generalted regression estimator under two-phase sampling. LÄS MER

  7. 5. Firms and people in place : driving forces for regional growth

    Författare :Wenjuan Li; Einar Holm; Urban Lindgren; Bo Malmberg; Umeå universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; regional growth; endogenous factors; place attractiveness; population redistribution; vicinity; workplace; local area; hinterland; spatial model; Sweden; Human geography; economic geography; Kulturgeografi; ekonomisk geografi;

    Sammanfattning : The aim of the thesis is to quantitatively study the driving forces and mechanisms for regional growth from an endogenous and exogenous perspective and reveal the most important factors contributing to regional growth, by focusing on three aspects: local labour market, the supply side and the demand side of the labour market. The thesis is designed to use Swedish micro register data to develop spatial models with higher spatial resolution. LÄS MER