Blar i NTNU Open på forfatter "Lindqvist, Bo Henry"
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Phase-type models for competing risks, with emphasis on identifiability issues
Lindqvist, Bo Henry (Peer reviewed; Journal article, 2022)We first review some main results for phase-type distributions, including a discussion of Coxian distributions and their canonical representations. We then consider the extension of phase-type modeling to cover competing ... -
Phase-type models involving restarting and instantaneous transitions, with applications to degradation and maintenance
Lindqvist, Bo Henry (Peer reviewed; Journal article, 2023)A phase-type distribution is the distribution of time to absorption for an absorbing continuous-time finite state Markov chain. The paper first reviews the extension of the phase-type setting to modeling of competing risks ... -
Power Modeling in Cross-Country Skiing: A Quantitative Approach by Sensitivity Analysis and Monte Carlo Simulation
Magnussen, Gina (Master thesis, 2019)En kvantitativ tilnærming til hvordan variasjoner i input påvirker output ved beregninger av krefter i kraftbalansemodellen i langrenn er presentert i dette studiet. Tre sprintløp og to langdistanseløp, inkludert både ... -
Preservation of the mean residual life order for coherent and mixed systems
Lindqvist, Bo Henry; Samaniego, Francisco J.; Wang, Nana (Journal article; Peer reviewed, 2019)The signature of a coherent system has been studied extensively in the recent literature. Signatures are particularly useful in the comparison of coherent or mixed systems under a variety of stochastic orderings. Also, ... -
Reliability Analysis of Fire Water Systems on Offshore Installations
Pettersen, Morten Nilstad (Master thesis, 2009)The background for this thesis is a change in the guidelines provided by the Norwegian petroleum industry regarding design of active and passive fire protection at offshore platforms. Now, it is possible to take into account ... -
Residuals and Functional Form in Accelerated Life Regression Models
Aaserud, Stein (Master thesis, 2011)This thesis examines misspecifed log-location-scale regression models. Particularily how the models' Cox Snell residuals can be used to infer the functional form of possibly misspecified covariates in the regression. Two ... -
Risk Factors for Breast, Uterine and Ovarian Cancer: A competing Risks Analysis
Grude, Lillian (Master thesis, 2011)A competing risks situation arises when a unit can fail due to several distinct failure types. In a competing risk situation, standard techniques from survival analysis may lead to incorrect and biased results. In this ... -
Some new results on the preservation of the NBUE and NWUE aging classes under the formation of coherent systems
Lindqvist, Bo Henry; Samaniego, Francisco J. (Journal article; Peer reviewed, 2019)We consider the classical problem of whether certain classes of lifetime distributions are preserved under the formation of coherent systems. Under the assumption of independent and identically distributed (i.i.d.) component ... -
Statistical modeling of maintenance on offshore oil and gas installations
Husby, Håkon (Master thesis, 2011)In this thesis it has been analyzed how the maintenance will evolve over time for different systems on oil and gas installations. Several statistical models have been proposed to analyze this, minimal repair models (NHPP), ... -
Stochastic Modelling and Simulation for Transit Shipping along the Northern Sea Route
Sælen, Erik (Master thesis, 2010)Because of ice melting in the Arctic areas, there is an increasing interest in the possibilities for transit shipping from Western Europe to Eastern Asia along the Northern Sea Route. However, there is still too much ice ... -
Systematic assessment of prescribed medications and short-term risk of myocardial infarction - a pharmacopeia-wide association study from Norway and Sweden
Sen, Abhijit; Vardaxis, Ioannis; Lindqvist, Bo Henry; Brumpton, Ben Michael; Strand, Linn B; Bakken, Inger Johanne Landsjøåsen; Vatten, Lars Johan; Romundstad, Pål Richard; Ljung, Rickard; Mukamal, Kenneth Jay; Janszky, Imre (Journal article; Peer reviewed, 2019)Wholesale, unbiased assessment of Scandinavian electronic health-care databases offer a unique opportunity to reveal potentially important undiscovered drug side effects. We examined the short-term risk of acute myocardial ... -
Variable selection in Cox-models using the L1-regularization path algorithm
Tuji, Mahder Assefa (Master thesis, 2010)The thesis give an overview of survival modelling and inference in Cox-models with high-dimensional covariates. -
Å estimere feilrater for periodisk testede flertilstandssystemer med sovende feil: I et bayesiansk rammeverk med Markov chain Monte Carlo-metoder
Bjørkli, Ingrid (Master thesis, 2009)Denne rapporten fra masteroppgaven på Industriell matematikk handler om å estimere feilrater for periodisk testede flertilstandssystemer med sovende feil. Dette gjøres i et bayesiansk rammeverk ved hjelp av Markov chain ...