O O Aalen
Affiliation: University of Oslo
- Survival models based on the Ornstein-Uhlenbeck processOdd O Aalen
Department of Statistics, Institute of Basic Medical Sciences, University of Oslo, P O Box 1122 Blindern, N 0317 Oslo, Norway
Lifetime Data Anal 10:407-23. 2004..We extend known results on this model. The results on quasi-stationarity are relevant for recent discussions about mortality plateaus. In addition, we point out a connection to models for short-term interest rates in financial modeling...
- Dynamic analysis of recurrent event data using the additive hazard modelJohan Fosen
Department of Biostatistics, Institute of Basic Medical Sciences, University of Oslo, N 0317 Oslo
Biom J 48:381-98. 2006..Theoretical considerations as well as simulations are presented, and a data set on recurrent bladder tumors is used to illustrate the methodology...
- Covariate adjustment of event histories estimated from Markov chains: the additive approachO O Aalen
Section of Medical Statistics, University of Oslo, Norway
Biometrics 57:993-1001. 2001..A program in R and S-PLUS that can carry out the analyses described here has been developed and is freely available on the Internet...
- Dynamic analysis of multivariate failure time dataOdd O Aalen
Section of Medical Statistics, University of Oslo, Blindern, N 0317 Oslo, Norway
Biometrics 60:764-73. 2004..A program in R and S-PLUS for analyzing survival data with the additive regression model is available on the web site http://www.med.uio.no/imb/stat/addreg. The program has been developed to fit the counting process framework...
- Regression models for infant mortality data in Norwegian siblings, using a compound Poisson frailty distribution with random scaleTron Anders Moger
Institute of Basic Medical Sciences, Department of Biostatistics, University of Oslo PO Box 1122 Blindern, N 0317 Oslo, Norway
Biostatistics 9:577-91. 2008..An application to data infant mortality in siblings from the Medical Birth Registry of Norway is included. We compare the results for some of the different covariate modeling options...
- Frailty modeling of bimodal age-incidence curves of nasopharyngeal carcinoma in low-risk populationsMarion Haugen
Department of Biostatistics, Institute of Basic Medical Sciences, University of Oslo, PO Box 1122 Blindern, N 0317 Oslo, Norway
Biostatistics 10:501-14. 2009..The results are critically compared and discussed in the context of existing knowledge of the epidemiology and pathogenesis of NPC...
- Adjusting and comparing survival curves by means of an additive risk modelP H Zahl
Section of Medical Statistics, University of Oslo
Lifetime Data Anal 4:149-68. 1998..The authors use a data set of malignant melanoma patients diagnosed from 1965 to 1974 in Norway. The 25-year survival of 1967 individuals is studied...
- A distribution for multivariate frailty based on the compound Poisson distribution with random scaleTron Anders Moger
Section of Medical Statistics, University of Oslo, P O Box 1122 Blindern, N 0317 Oslo, Norway
Lifetime Data Anal 11:41-59. 2005..An application to infant mortality data from the Medical Birth Registry of Norway is included, where the model is compared to more traditional shared frailty models...
- Analysis of testicular cancer data using a frailty model with familial dependenceTron A Moger
Section of Medical Statistics, University of Oslo, Norway
Stat Med 23:617-32. 2004..This indicates that the results are valid also if other distributions are used to model familial dependence in the compound Poisson frailty model...
- Frailty modelling of testicular cancer incidence using Scandinavian dataTron A Moger
Section of Medical Statistics, University of Oslo, P.O. Box 1122 Blindern, N-0317 Oslo, Norway
Biostatistics 5:1-14. 2004..This paper demonstrates that a model including a frailty effect fits the incidence data well and gives interesting results and interpretations, although this is no proof of the effect's truth...
- Spatial smoothing of cancer survival: a Bayesian approachK Osnes
Institute for Basic Medical Sciences, Section of Medical Statistics, University of Oslo, P O Box 1122 Blindern, N 0317 Oslo, Norway
Stat Med 18:2087-99. 1999..The estimates provided by the Cox and the FB approach resembled each other, but the FB approach gave more geographical details. In particular, the boundaries of the clusters of high or low survival provided by the FB are more realistic...
- Dynamic path analysis-a new approach to analyzing time-dependent covariatesJohan Fosen
Department of Biostatistics, Institute of Basic Medical Sciences, University of Oslo, P O Box 1122, N 0317, Blindern, Oslo, Norway
Lifetime Data Anal 12:143-67. 2006..The methodology is illustrated using data from a randomized trial on survival for patients with liver cirrhosis...
- Medical statistics--no time for complacencyO O Aalen
Section of Medical Statistics, University of Oslo, Blindern, Norway
Stat Methods Med Res 9:31-40. 2000..The need for further methodological development in this field is stressed. There is also need for connecting statistical work more intimately to biological knowledge than is the case today...
- Estimating influenza-related excess mortality and reproduction numbers for seasonal influenza in Norway, 1975-2004J M Gran
Department of Biostatistics, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
Epidemiol Infect 138:1559-68. 2010..Estimates of the reproduction number R, ranged from about 1 to 1.69...
- Analysis of censored discrete longitudinal data: estimation of mean responseNina Gunnes
Department of Biostatistics, Institute of Basic Medical Sciences, University of Oslo, N 0317 Oslo, Norway
Stat Med 28:605-24. 2009..Analyses of substantive data from (1) a study of symptoms experienced after a traumatic brain injury, and (2) a study of cognitive function among the elderly, are used as illustrations of the methods presented...
- Growth rates in epidemic models: application to a model for HIV/AIDS progressionJon Michael Gran
Department of Biostatistics, Institute of Basic Medical Sciences, University of Oslo, P O Box 1122, Blindern, N 0317 Oslo, Norway
Stat Med 27:4817-34. 2008..The work is illustrated by a model for HIV/AIDS progression among homosexual men in England and Wales. We conclude that other measures of growth, in addition to R0, give important supplementary information...
- Breast cancer tumor growth estimated through mammography screening dataHarald Weedon-Fekjaer
Department of Etiological Research, Cancer Registry of Norway, Institute of Population Based Cancer Research, Montebello, N 0310 Oslo, Norway
Breast Cancer Res 10:R41. 2008..In the present study based on the Norwegian Breast Cancer Screening Program, tumor growth was estimated from a large population using a new estimating procedure/model...
- The Mizon-Richard encompassing test for the Cox and Aalen additive hazards modelsTorben Martinussen
Department of Natural Sciences, University of Copenhagen, Thorvaldsensvej 40, DK 1871 Frederiksberg C, Denmark
Biometrics 64:164-71. 2008..The finite-sample properties of the proposed procedures are assessed through a simulation study. The methods are further applied to the well-known primary biliary cirrhosis data set...
- Frailty modelling of colorectal cancer incidence in Norway: indications that individual heterogeneity in risk is related to birth cohortElisabeth Svensson
The Cancer Registry of Norway, Institute of Population-based Cancer Research, Montebello, Oslo, N-0310 Norway
Eur J Epidemiol 21:587-93. 2006....
- Global tests in the additive hazards regression modelAxel Gandy
Department of Mathematics, Imperial College London, London, UK
Stat Med 27:831-44. 2008..This test is a natural extension of the logrank test. We shall also discuss an alternative covariance estimator. The tests are applied to a data set and a simulation study is performed...
- Estimating mean sojourn time and screening test sensitivity in breast cancer mammography screening: new resultsHarald Weedon-Fekjaer
Kreftregisteret, Institute of Population Based Cancer Research, Montebello, N 0310, Oslo, Norway
J Med Screen 12:172-8. 2005....
- Legal access to needles and syringes/needle exchange programmes versus HIV counselling and testing to prevent transmission of HIV among intravenous drug users: a comparative study of Denmark, Norway and SwedenEllen J Amundsen
Norwegian Institute for Alcohol and Drug Research, Oslo, Norway
Eur J Public Health 13:252-8. 2003..The objective of this study was to discuss the effectiveness of legal access to needles and syringes/ needle exchange programmes versus HIV counselling and testing among intravenous drug users (IDUs) as part of HIV prevention strategies...
- Age-incidence curves of nasopharyngeal carcinoma worldwide: bimodality in low-risk populations and aetiologic implicationsFreddie Bray
The Cancer Registry of Norway, Institute of Population Based Cancer Research, Montebello, N 0310 Oslo, Norway
Cancer Epidemiol Biomarkers Prev 17:2356-65. 2008..A modified model for NPC tumor development is proposed on the basis of these observations...
- Life course determinants for early disability pension: a follow-up of Norwegian men and women born 1967-1976Hans Magne Gravseth
National Institute of Occupational Health, P O Box 8149 Dep, 0033, Oslo, Norway
Eur J Epidemiol 22:533-43. 2007..We wanted to study possible determinants of an early DP with a life course perspective within a large register-based cohort, with a main focus on the biological and social factors from childhood...
- Bayesian back-calculation using a multi-state model with application to HIVMichael J Sweeting
MRC Biostatistics Unit, Institute of Public Health, University Forvie Site, Robinson Way, Cambridge CB2 2SR, UK
Stat Med 24:3991-4007. 2005..The idea is illustrated on data from the HIV epidemic in homosexuals in England and Wales...
- Inter-rater reliability of clinician-rated outcome measures in child and adolescent mental health servicesKetil Hanssen-Bauer
Centre for Child and Adolescent Mental Health, Eastern and Southern Norway, P O Box 4623, Nydalen, NO 0405, Oslo, Norway
Adm Policy Ment Health 34:504-12. 2007..81 (single scales 0.47-0.96), for the CGAS 0.61 and for the GAPD 0.60. The reliability was not lower on patients. The rater's profession, experience or clinic did not have effect on the scores...
- Cross-national reliability of clinician-rated outcome measures in child and adolescent mental health servicesKetil Hanssen-Bauer
Centre for Child and Adolescent Mental Health, Eastern and Southern Norway, P O Box 4623, Nydalen, Oslo, NO 0405, Norway
Adm Policy Ment Health 34:513-8. 2007..The ICC for the HoNOSCA total score was 0.84, for the CGAS 0.61 and for the GAPD 0.54. These measures may usefully contribute to cross-national comparison studies...
- [Why Bayesian thinking?]Odd O Aalen
Tidsskr Nor Laegeforen 122:1354. 2002