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Visar resultat 1 - 5 av 338 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Latent variable models for longitudinal twin data

   Författare :Annica Dominicus; Juni Palmgren; Nancy L. Pedersen; Michael G. Kenward; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Latent variable models; twin models; variance components; change point models; non-ignorable nonresponse; likelihood ratio tests; Mathematical statistics; Matematisk statistik;

   Sammanfattning : Longitudinal twin data provide important information for exploring sources of variation in human traits. In statistical models for twin data, unobserved genetic and environmental factors influencing the trait are represented by latent variables. In this way, trait variation can be decomposed into genetic and environmental components. LÄS MER

3. 2. Aspects of Declarative Memory Functioning in Adulthood : Cross-Sectional and Longitudinal Studies

   Författare :Michael Rönnlund; Elizabeth Maylor; Umeå universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Psychology; aging; episodic memory; sematic memory; encoding support; crosssectional; longitudinal; Psykologi; Psychology; Psykologi; Psychology; psykologi;

   Sammanfattning : The general objective of the thesis was to examine aspects of declarative memory functioning across the adult life span. The four papers were based on data collected as part of the Betula Prospective Cohort Study (Nilsson et al., 1997) and included largescale population-based samples of participants in the age range 35 to 90. LÄS MER

4. 3. Understanding the social integration of adolescents of foreign origin : Longitudinal investigations of inter-origin friendship formation

   Författare :Olov Aronson; Disa Bergnéhr; Arne Gerdner; Sofia Enell; Michael Wells; Emma Sorbring; Jönköping University; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; social integration; friendship; adolescence; longitudinal; Sweden; LoRDIA; Resettlement Strategies in Families;

   Sammanfattning : The present dissertation aims to understand some of the opportunities for, and influences on, the social integration of adolescents of foreign origin in Sweden. Informed by previous research, the dissertation suggests that successful social integration involves friendship formation between peers of similar origins (intra-origin friendship formation) as well as friendship formation between peers of different origins (inter-origin friendship formation). LÄS MER

5. 4. Restrained Eating : Development and Models of Prediction in Girls

   Författare :Katarina Lunner; Per-Olow Sjödén; Jon Christian Laberg; Uppsala universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Caring sciences; teasing; body image; disturbed eating; cross-cultural; longitudinal; path analysis; structural model; Vårdvetenskap; Caring sciences; Vårdvetenskap; omvårdnadsforskning med medicinsk inriktning; Caring Sciences;

   Sammanfattning : Body image concerns and dieting emerge at an early age among girls and become more pronounced with increasing age. Knowledge about risk factors for disturbed eating is crucial in order to develop theoretical models and to suggest new paths for preventive efforts. LÄS MER

7. 5. Intelligence and models for cognitive development

   Författare :Linda Wänström; Daniel Thorburn; Gösta Hägglund; Dag Sörbom; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; intelligence; cognitive development; sample size; multilevel models; latent growth curve models; Statistics; Statistik; statistik; Statistics;

   Sammanfattning : This dissertation focuses on cognitive development. In papers I and II, I study a special model, the second order latent growth curve model, that can be used to study cognitive development. Algebraic expressions for the variance of the estimation of slope differences are given. LÄS MER