Sökning: "sampling weights"

Visar resultat 6 - 10 av 25 avhandlingar innehållade orden sampling weights.

  1. 6. Mathematical programming for optimal probability weighting

    Författare :Michele Santacatterina; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : In spite of the fact that probability weighting is widely used in statistics to correct for unequal sampling, control for confounding, and handle missing data, it has two main limitations. First, statistical inferences may be inefficient in the presence of extreme probability weights. LÄS MER

  3. 7. Price measurement and index construction : some contributions to theory and application

    Författare :Jörgen Dalén; Stockholms universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Konsumentprisindex;

    Sammanfattning : Four different problems are treated, all concerned with problems arising when compiling price indexes in official statistics. One deals with the computation of so called elementary aggregates, low level indexes for single products, when proper weights for the observations are not available. LÄS MER

  4. 8. Carlson type inequalities and their applications

    Författare :Leo Larsson; Viktor Burenkov; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Mathematical analysis; Carlson’s inequality; weighted inequality; Lp space; general measure space; interpolation; embedding; Matematisk analys; Mathematical analysis; Analys; matematik; Mathematics;

    Sammanfattning : This thesis treats inequalities of Carlson type, i.e. inequalities of the form∥f∥x≤K∏i=1m∥f∥Aiθiwhere ∑i=1mθi =1 and K is some constant, independent of the function f. X and Ai are normed spaces, embedded in some Hausdorff topological vector space. LÄS MER

  5. 9. On Invertibility of the Radon Transform and Compressive Sensing

    Författare :Joel Andersson; Jan-Olov Strömberg; Mikko Salo; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Radon transform; invertibility; compressive sensing; stability estimates; Mathematics; Matematik;

    Sammanfattning : This thesis contains three articles. The first two concern inversion andlocal injectivity of the weighted Radon transform in the plane. The thirdpaper concerns two of the key results from compressive sensing.In Paper A we prove an identity involving three singular double integrals. LÄS MER

  7. 10. Asymptotics, weak convergence and duality in population genetics

    Författare :Martina Favero; Henrik Hult; Alison Etheridge; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This thesis consists of four papers on asymptotic results and stochastic duality for some processes in mathematical population genetics. The focus is on Wright-Fisher diffusions and coalescent processes, which model, respectively, the evolution of frequencies of genetic types and genealogies in a population,and play a key role in inference on genetic data sets. LÄS MER