Sökning: "Cox regression"

Visar resultat 1 - 5 av 251 avhandlingar innehållade orden Cox regression.

1. 1. Essays on the Assumption of Proportional Hazards in Cox Regression

   Författare :Inger Persson; Kenneth Carling; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Informatics; computer and systems science; Proportional hazards; Cox regression; Proportionality assumption; Informatik; data- och systemvetenskap; Informatics; computer and systems science; Informatik; data- och systemvetenskap; statistik; Statistics;

   Sammanfattning : This thesis consists of four papers about the assumption of proportional hazards for the Cox model in survival analysis. The first paper compares the hazard ratio estimated from the Cox model to an exact calculation of the geometric average of the hazard ratio when the underlying assumption of proportional hazards is false, i.e. LÄS MER

3. 2. Strategies for assessing health risks from two occupational cohorts within the domain of northern Sweden

   Författare :Ove Björ; Tohr Nilsson; Håkan Jonsson; Lena Damber; Per Gustavsson; Umeå universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Cohort; mortality; incidence; risk; rate; cancer; cerebrovascular diseases; exposure; occupational; mining; industry; worker; Poisson regression; Cox regression; SMR; causal inference; G-estimation; Occupational and Environmental Medicine; arbets- och miljömedicin; epidemiologi; Epidemiology;

   Sammanfattning : Background: Studies based on a cohort design requires access to both subject-specific and period-specific information. In order to conduct an occupational cohort study, access to exposure information and the possibility and permission to link information on outcomes from other registers are generally necessary. LÄS MER

4. 3. Multiple Time Scales and Longitudinal Measurements in Event History Analysis

   Författare :Danardono; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Statistics; Cox regression; multiple events; proportiona hazards; random effects; survival analysis; time-dependent covariates; time origin; Statistik; Statistics; Statistik; Statistics; statistik;

   Sammanfattning : A general time-to-event data analysis known as event history analysis is considered. The focus is on the analysis of time-to-event data using Cox's regression model when the time to the event may be measured from different origins giving several observable time scales and when longitudinal measurements are involved. LÄS MER

5. 4. Should I stay or should I go – Factors associated with hospitalization risk among older persons in Sweden

   Författare :Jenny Hallgren; Anna K. Dahl Aslan; Eleonor Fransson; Marie Elf; Jönköping University; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Older persons; hospitalization; risk factors; cognitive decline; qualitative content analyses; longitudinal; Cox regression; latent growth curve modelling;

   Sammanfattning : An increasingly older population will most likely lead to greater demands on the health care system, as older age is associated with an increased risk of having acute and chronic conditions. The number of diseases or disabilities is not the only marker of the amount of health care utilized, as persons may seek hospitalization without a disease and/or illness that requires hospital healthcare. LÄS MER

7. 5. There's more to the picture than meets the ear - Gaze behavior during communication in children with hearing impairment

   Författare :Olof Sandgren; foniatri och audiologi Logopedi; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Child hearing impairment; Gaze behavior; Referential communication; Eye tracking; Nonword repetition; Phonological short term memory; Cox regression;

   Sammanfattning : Many children and adolescents with hearing impairment struggle to meet school demands. The difficulties can be traced to the characteristics of the hearing impairment, and to adverse consequences on language development, often overlooked in diagnostics and intervention. LÄS MER