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Svensson, Ingrid
Publications (10 of 15) Show all publications
Barban, N., de Luna, X., Lundholm, E., Svensson, I. & Billari, F. C. (2017). Causal Effects of the Timing of Life-course Events: Age at Retirement and Subsequent Health. Sociological Methods & Research
Open this publication in new window or tab >>Causal Effects of the Timing of Life-course Events: Age at Retirement and Subsequent Health
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2017 (English)In: Sociological Methods & Research, ISSN 0049-1241, E-ISSN 1552-8294Article in journal (Refereed) Epub ahead of print
Abstract [en]

n this article, we combine the extensive literature on the analysis of life-course trajectories as sequences with the literature on causal inference and propose a new matching approach to investigate the causal effect of the timing of life-course events on subsequent outcomes. Our matching approach takes into account pre-event confounders that are both time-independent and time-dependent as well as life-course trajectories. After matching, treated and control individuals can be compared using standard statistical tests or regression models. We apply our approach to the study of the consequences of the age at retirement on subsequent health outcomes, using a unique data set from Swedish administrative registers. Once selectivity in the timing of retirement is taken into account, effects on hospitalization are small, while early retirement has negative effects on survival. Our approach also allows for heterogeneous treatment effects. We show that the effects of early retirement differ according to preretirement income, with higher income individuals tending to benefit from early retirement, while the opposite is true for individuals with lower income.

Place, publisher, year, edition, pages
Sage Publications, 2017
Keywords
life-course analysis, matching, propensity score, retirement, register data, sequence analysis
National Category
Probability Theory and Statistics
Research subject
Statistics
Identifiers
urn:nbn:se:umu:diva-142215 (URN)10.1177/0049124117729697 (DOI)881251 (Local ID)881251 (Archive number)881251 (OAI)
Available from: 2017-11-26 Created: 2017-11-26 Last updated: 2019-04-04
Svensson, I., Lundholm, E., De Luna, X. & Malmbeg, G. (2015). Family Life Course and the Timing of Women's Retirement: a Sequence Analysis Approach. Population, Space and Place, 21(8), 856-871
Open this publication in new window or tab >>Family Life Course and the Timing of Women's Retirement: a Sequence Analysis Approach
2015 (English)In: Population, Space and Place, ISSN 1544-8444, E-ISSN 1544-8452, Vol. 21, no 8, p. 856-871Article in journal (Refereed) Published
Abstract [en]

Based on longitudinal data from national Swedish registers, family life courses dynamics for all women born 1935 in Sweden are explored for the period 1990-2006. Focusing primarily on the existence and geographical proximity to parents, children and grandchildren, assuming that the family life courses affect the life situation as well as strategic decisions, this longitudinal study uses a holistic approach, analysing how different types of family life courses are associated with socio-economic conditions as well as with the timing of retirement. The primary task was not to identify the causal determinants of work life exit, but rather to unfold how retirement transition is entwined into the different types of family life courses, whereby retirement and family ageing are different sides of a multifaceted transition period. By using sequence analysis, the family life courses were structured into sequences and durations of states and different family life course categories were identified.

The sequence analyses reveal a complex relation between retirement decisions and having family members around. Early retirement was associated with a category with few relatives but also with a category with two younger generations present, while we found no strong association with early retirement for categories in which the old generation was around for a longer period. Late retirement was associated with belonging to categories characterized by late family formation and having children at home. These differences in retirement behaviour were also significant when controlling for education level, marital status and type of region in a Cox regression.

Place, publisher, year, edition, pages
John Wiley & Sons, 2015
Keywords
family life course; family networks; intergeneration; retirement; sequence analysis
National Category
Human Geography Probability Theory and Statistics
Research subject
Social and Economic Geography; Statistics
Identifiers
urn:nbn:se:umu:diva-105426 (URN)10.1002/psp.1950 (DOI)000364638500013 ()881251 (Local ID)881251 (Archive number)881251 (OAI)
Projects
Centre for Demographic and Ageing Research / Ageing and Living Conditions Programme
Funder
Swedish Research Council, 349-2008-6592Swedish Research Council, 839-2008-7491Swedish Research Council, 2008-28784-63564-191
Available from: 2015-06-29 Created: 2015-06-23 Last updated: 2019-02-15Bibliographically approved
Svensson, I. (2015). Pedagogisk meritering: navelskåderi eller tillfälle för gemensam reflektion kring undervisning och lärande?. In: Universitetspedagogiska konferensen 2015: Gränslös kunskap. Paper presented at Universitetspedagogiska konferensen 2015, Gränslös kunskap, Umeå, 8-9 oktober 2015 (pp. 58-60). Umeå: Umeå universitet
Open this publication in new window or tab >>Pedagogisk meritering: navelskåderi eller tillfälle för gemensam reflektion kring undervisning och lärande?
2015 (Swedish)In: Universitetspedagogiska konferensen 2015: Gränslös kunskap, Umeå: Umeå universitet , 2015, p. 58-60Conference paper, Published paper (Other academic)
Place, publisher, year, edition, pages
Umeå: Umeå universitet, 2015
National Category
Educational Sciences
Identifiers
urn:nbn:se:umu:diva-114133 (URN)
Conference
Universitetspedagogiska konferensen 2015, Gränslös kunskap, Umeå, 8-9 oktober 2015
Available from: 2016-01-14 Created: 2016-01-14 Last updated: 2018-06-07Bibliographically approved
Svensson, I. & Sjöstedt-de Luna, S. (2010). Asymptotic properties of a stochastic EM algorithm for mixtures with censored data. Journal of Statistical Planning and Inference, 140(1), 111-127
Open this publication in new window or tab >>Asymptotic properties of a stochastic EM algorithm for mixtures with censored data
2010 (English)In: Journal of Statistical Planning and Inference, ISSN 0378-3758, E-ISSN 1873-1171, Vol. 140, no 1, p. 111-127Article in journal (Refereed) Published
Abstract [en]

Weak consistency and asymptotic normality is shown for a stochastic EM algorithm for censored data from a mixture of distributions under lognormal assumptions. The asymptotic properties hold for all parameters of the distributions, including the mixing parameter. In order to make parameter estimation meaningful it is necessary to know that the censored mixture distribution is identifiable. General conditions under which this is the case are given. The stochastic EM algorithm addressed in this paper is used for estimation of wood fibre length distributions based on optically measured data from cylindric wood samples (increment cores).

Place, publisher, year, edition, pages
Elsevier, 2010
Keywords
Censoring; Fibre length distribution; Identifiability; Increment core; Mixture; Stochastic EM algorithm
National Category
Mathematics Probability Theory and Statistics
Research subject
Mathematical Statistics; Statistics
Identifiers
urn:nbn:se:umu:diva-29776 (URN)10.1016/j.jspi.2009.06.014 (DOI)000271354300010 ()
Available from: 2009-11-24 Created: 2009-11-23 Last updated: 2018-06-08Bibliographically approved
Isaksson, C., Lindkvist, M. & Svensson, I. (2010). När två blir ett: en lyckosam integrering av kurser i kvalitativ och kvantitativ metod i ett unikt samarbete mellan Statisktiska institutionen och institutionen för Socialt arbete. In: Erik Lindenius (Ed.), Undervisning på tvären: . Paper presented at Den nionde universitetspedagogiska konferensen, 25-26 februari 2009 (pp. 77-92).
Open this publication in new window or tab >>När två blir ett: en lyckosam integrering av kurser i kvalitativ och kvantitativ metod i ett unikt samarbete mellan Statisktiska institutionen och institutionen för Socialt arbete
2010 (Swedish)In: Undervisning på tvären / [ed] Erik Lindenius, 2010, p. 77-92Conference paper, Published paper (Refereed)
Abstract [sv]

Sedan höstterminen 2006 ges en integrerad kurs i kvalitativ och kvantitativ metod på socionomprogrammet vid Umeå universitet. Tidigare ansvarade institutionen för Socialt arbete för en kvalitativ metodkurs och Statistiska institutionen för en kvantitativ metodkurs. Under hösten 2005 kom direktiv från Ledningsgruppen för socionomprogrammet att en integrerad metodkurs skulle startas med början höstterminen 2006. Med integrering som ledord lämnades de kursansvariga från respektive institution med uppdraget att utveckla och genomföra denna nya form av metodkurs - en integrerad metodkurs som saknade motsvarighet vid såväl Umeå universitet som andra lärosäten i Sverige. Kursens pedagogiska upplägg utgår från teorier kring experimentellt lärande vilket tydliggörs genom att kursen är uppbyggd kring en processövning som löper under hela kursen och som integrerar praktiska moment med teori. Arbetet med processövningen sker i grupper om 5-7 studenter. Under de fem terminer som kursen getts har ett intensivt förändrings- och utvecklingsarbete utförts av lärarna på Statistiska institutionen och Institutionen för Socialt arbete. Både studenter och undervisande lärare uttrycker att de är nöjda med det pedagogiska upplägget av den integrerade metodkursen. Genom integreringen har förutsättningar skapats för en fördjupad reflektion hos studenterna kring fördelarna med att använda båda de vetenskapliga angreppssätten kvalitativ och kvantitativ metod.

Series
Skriftserie från universitetspedagogiskt centrum, ISSN 1651-5692 ; 2010:1
National Category
Educational Sciences
Identifiers
urn:nbn:se:umu:diva-31172 (URN)
Conference
Den nionde universitetspedagogiska konferensen, 25-26 februari 2009
Available from: 2010-02-03 Created: 2010-02-01 Last updated: 2018-06-08Bibliographically approved
Lundberg, A. & Svensson, I. (2009). Restored to Society - The Recovering of Mentally Ill Patients in the Northern Parts of Sweden 1893-1902. In: Astri Andresen (Ed.), Healthcare Systems and Medical Instiutions. Oslo: Novus AS
Open this publication in new window or tab >>Restored to Society - The Recovering of Mentally Ill Patients in the Northern Parts of Sweden 1893-1902
2009 (English)In: Healthcare Systems and Medical Instiutions / [ed] Astri Andresen, Oslo: Novus AS , 2009Chapter in book (Other academic)
Place, publisher, year, edition, pages
Oslo: Novus AS, 2009
Identifiers
urn:nbn:se:umu:diva-31005 (URN)978-82-7099-562-2 (ISBN)
Available from: 2010-01-26 Created: 2010-01-26 Last updated: 2018-06-08
Svensson, I. & de Luna, S. (2007). A stochastic EM algorithm to estimate wood fibre length distributions from censored data. In: Bulletin of the International Statistical Institute, 56th session: Lissboa, August, 2007.
Open this publication in new window or tab >>A stochastic EM algorithm to estimate wood fibre length distributions from censored data
2007 (English)In: Bulletin of the International Statistical Institute, 56th session: Lissboa, August, 2007, 2007Conference paper, Published paper (Refereed)
Identifiers
urn:nbn:se:umu:diva-8082 (URN)
Available from: 2008-01-14 Created: 2008-01-14 Last updated: 2018-06-09Bibliographically approved
Svensson, I., Sjöstedt-de Luna, S., Mörling, T., Fries, A. & Ericsson, T. (2007). Adjusting for fibre length-biased sampling probability using increment cores from standing trees. Holzforschung, 61(1), 101-103
Open this publication in new window or tab >>Adjusting for fibre length-biased sampling probability using increment cores from standing trees
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2007 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 61, no 1, p. 101-103Article in journal (Refereed) Published
Place, publisher, year, edition, pages
de Gruyter, ReferenceGlobal, 2007
Keywords
fibre length distribution, fines, length bias, sampling probability, Scots pine, tracheids
Identifiers
urn:nbn:se:umu:diva-2251 (URN)10.1515/HF.2007.016, 01/01/2007 (DOI)
Available from: 2007-04-24 Created: 2007-04-24 Last updated: 2018-06-09Bibliographically approved
Svensson, I. & de Luna, S. (2007). Asymptotic properties of a stochastic EM algorithm for mixtures with censored data.
Open this publication in new window or tab >>Asymptotic properties of a stochastic EM algorithm for mixtures with censored data
2007 (English)Report (Other academic)
Series
Research Report in Mathematical Statistics, ISSN 1653-0829 ; 1, 2007
Identifiers
urn:nbn:se:umu:diva-8390 (URN)
Available from: 2008-01-20 Created: 2008-01-20 Last updated: 2018-06-09Bibliographically approved
Svensson, I. (2007). Estimation of wood fibre length distributions from censored mixture data. (Doctoral dissertation). Umeå: Matematik och matematisk statistik
Open this publication in new window or tab >>Estimation of wood fibre length distributions from censored mixture data
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The motivating forestry background for this thesis is the need for fast, non-destructive, and cost-efficient methods to estimate fibre length distributions in standing trees in order to evaluate the effect of silvicultural methods and breeding programs on fibre length. The usage of increment cores is a commonly used non-destructive sampling method in forestry. An increment core is a cylindrical wood sample taken with a special borer, and the methods proposed in this thesis are especially developed for data from increment cores. Nevertheless the methods can be used for data from other sampling frames as well, for example for sticks with the shape of an elongated rectangular box.

This thesis proposes methods to estimate fibre length distributions based on censored mixture data from wood samples. Due to sampling procedures, wood samples contain cut (censored) and uncut observations. Moreover the samples consist not only of the fibres of interest but of other cells (fines) as well. When the cell lengths are determined by an automatic optical fibre-analyser, there is no practical possibility to distinguish between cut and uncut cells or between fines and fibres. Thus the resulting data come from a censored version of a mixture of the fine and fibre length distributions in the tree. The methods proposed in this thesis can handle this lack of information.

Two parametric methods are proposed to estimate the fine and fibre length distributions in a tree. The first method is based on grouped data. The probabilities that the length of a cell from the sample falls into different length classes are derived, the censoring caused by the sampling frame taken into account. These probabilities are functions of the unknown parameters, and ML estimates are found from the corresponding multinomial model.

The second method is a stochastic version of the EM algorithm based on the individual length measurements. The method is developed for the case where the distributions of the true lengths of the cells at least partially appearing in the sample belong to exponential families. The cell length distribution in the sample and the conditional distribution of the true length of a cell at least partially appearing in the sample given the length in the sample are derived. Both these distributions are necessary in order to use the stochastic EM algorithm. Consistency and asymptotic normality of the stochastic EM estimates is proved.

The methods are applied to real data from increment cores taken from Scots pine trees (Pinus sylvestris L.) in Northern Sweden and further evaluated through simulation studies. Both methods work well for sample sizes commonly obtained in practice.

Place, publisher, year, edition, pages
Umeå: Matematik och matematisk statistik, 2007. p. 24
Keywords
censoring, fibre length distribution, identifiability, increment core, length bias, mixture, stochastic EM algorithm
National Category
Probability Theory and Statistics
Identifiers
urn:nbn:se:umu:diva-1094 (URN)978-91-7264-300-0 (ISBN)
Public defence
2007-05-16, MA121, MIT, 901 87, Umeå, 13:15
Opponent
Supervisors
Available from: 2007-04-24 Created: 2007-04-24 Last updated: 2018-06-09Bibliographically approved
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