Sökning: "Covariation"

Visar resultat 1 - 5 av 37 avhandlingar innehållade ordet Covariation.

  1. 1. Rate as the relation of changes in two quantities : A variation theory perspective of learning rate of change

    Författare :Per Håkansson; Robert Gunnarsson; Ulla Runesson Kempe; Jönköping University; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; rate of change; slope; covariation; functions; mathematics teaching and learning; variation theory; learning study; förändringstakt; lutning; samvariation; funktioner; matematiklärande; variationsteori; learning study;

    Sammanfattning : This thesis comprises three original papers about learning rate of change in school mathematics. The overall aim of the thesis is to contribute with knowledge in this particular area of research. Within this aim, each of the original papers contribute with its own perspective. LÄS MER

  3. 2. The psychology of diversification: Novice investors´ability to spread risks

    Författare :Martin Hedesström; Göteborgs universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Covariation neglect; Novice investors; Portfolio diversification; Diversification heuristic; Behavioural economics; Ekonomisk psykologi;

    Sammanfattning : In order to reduce risk, portfolio theory prescribes holding a stock portfolio that is diversified across industries and countries. This thesis investigates novice investors’ ability to compile well-diversified portfolios and to what extent psychological factors may affect diversification. LÄS MER

  4. 3. Suicidal behaviour in children and adolescents in Sweden and some European countries : epidemiological and clinical aspects

    Författare :Agnes Hultén; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :young people; suicide; attempted suicide; trends; covariation; repetition patterns; care;

    Sammanfattning : The starting point for this thesis is the empirical observation that in Sweden, as in many other European countries, suicide is the leading cause of death among men aged 15-34 and ranks second for young females. Attempted suicide also constitutes a major public-health problem both in Sweden and in the rest of Europe. LÄS MER

  5. 4. Genetic and environmental influences on antisocial behavior from childhood to emerging adulthood

    Författare :Catherine Tuvblad; Sweden Karolinska Institutet Department of Medical Epidemiology and Biostatistics; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; antisocial and aggressive behavior; psychopathic personality traits; socioeconomic status; childhood; adolescence; genes; environments; sex differences; development; covariation; interactions; Psychology;

    Sammanfattning : Antisocial behavior, in other words, normative and rule-breaking behavior, is a major problem in societies all over the world. Because many antisocial behavioral problems start in childhood or adolescence, the study of such behavior problems during this developmental period should contribute to an understanding of the etiology of adult psychopathology. LÄS MER

  7. 5. Genetic epidemiology of cardiometabolic biomarkers : twin studies in the genomic era

    Författare :Xu Chen; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Following the Human Genome Project, many genomic approaches have been developed in genetic epidemiology to investigate the genetic influences on human complex traits. This thesis aims to answer four genetic epidemiological questions for cardiometabolic biomarkers/ traits, by using classical twin studies and novel genomic methods. LÄS MER