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Staff photo Magnus Ekström

Magnus Ekström

Research qualifications: Docent
0000-0002-7886-0911

Contact

E-mail
magnus.ekstrom@umu.se
Phone
+46 90 786 52 12

Works at

Affiliation
Associate professor at Umeå School of Business, Economics and Statistics (USBE) Section: Statistics
Location
Samhällsvetarhuset, Biblioteksgränd 6 Umeå universitet, 901 87 Umeå

Research interests

Theory and method: Statistical inference under nonstandard conditions; Resampling, subsampling and bootstrap methods, in particular for nonstationary data; Tests of symmetry; Interval censoring; Transect sampling; Nearest neighbor methods.

Fields of application: Forestry; Remote Sensing; Economics; Occupational and Environmental Medicine.

Quantile regression with interval-censored data in questionnaire-based studies
Computational statistics (Zeitschrift), Springer Berlin/Heidelberg 2024, Vol. 39, (2) : 583-603
Angelov, Angel G.; Ekström, Magnus; Puzon, Klarizze; et al.
Estimation of plant density based on presence/absence data using hybrid inference
Ecological Informatics, Elsevier 2024, Vol. 80
Gozé, Léna; Ekström, Magnus; Sandring, Saskia; et al.
Computation of prediction intervals for forest aboveground biomass predictions using generalized linear models in a large-extent boreal forest region
Forestry (London)
Mukhopadhyay, Ritwika; Ekström, Magnus; Lindberg, Eva; et al.
Why ecosystem characteristics predicted from remotely sensed data are unbiased and biased at the same time – and how this affects applications
Forest Ecosystems, Elsevier 2024, Vol. 11
Ståhl, Göran; Gobakken, Terje; Saarela, Svetlana; et al.
Tests of stochastic dominance with repeated measurements data
AStA Advances in Statistical Analysis, Springer 2023, Vol. 107, (3) : 443-467
Angelov, Angel G.; Ekström, Magnus
Model-based estimation and mapping of plant density based on remotesensing and presence/absence data
The 29th Nordic Conference in Mathematical Statistics, NORDSTAT 2023, Gothenburg, Sweden, June 19-22 2023
Ekström, Magnus; Gozé, Léna; Wallerman, Jörgen; et al.
Influence of canopy structure and light on the three-dimensional distribution of the iconic lichen Usnea longissima
Forest Ecology and Management, Elsevier 2023, Vol. 529
Esseen, Per-Anders; Ekström, Magnus
Comparing TanDEM-X InSAR forest stand volume prediction models trained using field and ALS data
IGARSS 2023 - 2023 IEEE International Geoscience and Remote Sensing Symposium: proceedings, IEEE 2023 : 3253-3256
Mukhopadhyay, Ritwika; Nilsson, Mats; Ekström, Magnus; et al.
Multiple drivers of large-scale lichen decline in boreal forest canopies
Global Change Biology, John Wiley & Sons 2022, Vol. 28, (10) : 3293-3309
Esseen, Per-Anders; Ekström, Magnus; Grafström, Anton; et al.
Self-selected interval judgments compared to point judgments: A weight judgment experiment in the presence of the size-weight illusion
PLOS ONE, Public Library of Science 2022, Vol. 17, (3 March)
Gonzalez, Nichel; Svenson, Ola; Ekström, Magnus; et al.
Quantify and account for field reference errors in forest remote sensing studies
Remote Sensing of Environment, Elsevier 2022, Vol. 283
Persson, Henrik Jan; Ekström, Magnus; Ståhl, Göran
Comparing frameworks for biomass prediction for the Global Ecosystem Dynamics Investigation
Remote Sensing of Environment, Elsevier 2022, Vol. 278
Saarela, Svetlana; Holm, Sören; Healey, Sean P.; et al.
A Comparison of Model-Assisted Estimators, With and Without Data-Driven Transformations of Auxiliary Variables, With Application to Forest Inventory
Frontiers in Forests and Global Change, Frontiers Media S.A. 2021, Vol. 4
Ekström, Magnus; Nilsson, Mats
Estimating density from presence/absence data in clustered populations
The 28th Nordic Conference in Mathematical Statistics, NORDSTAT 2021, Tromsø, Norway, June 21 – 24, 2021.
Ekström, Magnus; Sandring, Saskia; Grafström, Anton; et al.
Rapid changes in ground vegetation of mature boreal forests: an analysis of Swedish national forest inventory data
Forests, MDPI 2021, Vol. 12, (4)
Jonsson, Bengt Gunnar; Dahlgren, Jonas; Ekström, Magnus; et al.
A class of asymptotically efficient estimators based on sample spacings
Test (Madrid), Springer Berlin/Heidelberg 2020, Vol. 29, (3) : 617-636
Ekström, Magnus; Mirakhmedov, S. M.; Jammalamadaka, S. Rao
Estimating density from presence/absence data in clustered populations
Methods in Ecology and Evolution, John Wiley & Sons 2020, Vol. 11, (3) : 390-402
Ekström, Magnus; Sandring, Saskia; Grafström, Anton; et al.
Presence-absence sampling for estimating plant density using survey data with variable plot size
Methods in Ecology and Evolution, John Wiley & Sons 2020, Vol. 11, (4) : 580-590
Ståhl, Göran; Ekström, Magnus; Dahlgren, Jonas; et al.
Maximum likelihood estimation for survey data with informative interval censoring
AStA Advances in Statistical Analysis, Springer 2019, Vol. 103, (2) : 217-236
Angelov, Angel G.; Ekström, Magnus
Four-decision tests for stochastic dominance, with an application to environmental psychophysics
Journal of mathematical psychology (Print), Elsevier 2019, Vol. 93
Angelov, Angel G.; Ekström, Magnus; Kriström, Bengt; et al.
A class of asymptotically efficient estimators based on sample spacings
EMS 2019 - Program and Book of Abstracts : 95-95
Ekström, Magnus; Mirakhmedov, Sherzod M.; Jammalamadaka, S. Rao
Combinaison d’échantillons probabilistes indépendants
Survey Methodology, Statistics Canada 2019, Vol. 45, (2) : 371-387
Grafström, Anton; Ekström, Magnus; Jonsson, Bengt Gunnar; et al.
On combining independent probability samples
Survey Methodology, Statistics Canada 2019, Vol. 45, (2) : 349-364
Grafström, Anton; Ekström, Magnus; Jonsson, Bengt Gunnar; et al.
Logistic regression for clustered data from environmental monitoring programs
Ecological Informatics, Elsevier 2018, Vol. 43 : 165-173
Ekström, Magnus; Esseen, Per-Anders; Westerlund, B.; et al.
A class of asymptotically efficient estimators based on sample spacings
The 27th Nordic Conference in Mathematical Statistics: Abstracts, University of Tartu 2018 : 20-20
Ekström, Magnus; Mirakhmedov, S. M.; Jammalamadaka, S. R.
Morphology drives water storage traits in the globally widespreadlichen genus Usnea
Fungal ecology, Elsevier 2018, Vol. 35 : 51-61
Eriksson, Amanda; Gauslaa, Yngvar; Palmqvist, Kristin; et al.
Nonparametric estimation for self-selected interval data collected through a two-stage approach
Metrika (Heidelberg), Springer 2017, Vol. 80, (4) : 377-399
Angelov, Angel G.; Ekström, Magnus
Informative plot sizes in presence-absence sampling of forest floor vegetation
Methods in Ecology and Evolution, Hoboken: British Ecological Society 2017, Vol. 8, (10) : 1284-1291
Ståhl, Göran; Ekström, Magnus; Dahlgren, Jonas; et al.
Broad-scale distribution of epiphytic hair lichens correlates more with climate and nitrogen deposition than with forest structure
Canadian Journal of Forest Research, NRC Research Press 2016, Vol. 46, (11) : 1348-1358
Esseen, Per-Anders; Ekström, Magnus; Westerlund, Bertil; et al.
Dead wood availability in managed Swedish forests: policy outcomes and implications for biodiversity
Forest Ecology and Management, Elsevier 2016, Vol. 376 : 174-182
Jonsson, Bengt Gunnar; Ekström, Magnus; Esseen, Per-Anders; et al.
Edgeworth expansions for two-stage sampling with applications to stratified and cluster sampling
Canadian Journal of Statistics / Revue Canadienne de Statistique, Vol. 43, (4) : 578-599
Mirakhmedov, Sherzod M.; Jammalamadaka, Sreenivasa R.; Ekström, Magnus
A general central limit theorem for strong mixing sequences
Statistics and Probability Letters, Elsevier 2014, Vol. 94 : 236-238
Ekström, Magnus
Powerful parametric tests based on sum-functions of spacings
Scandinavian Journal of Statistics, Vol. 40, (4) : 886-898
Ekström, Magnus
Tests based on sum-functions of spacings
24th Nordic Conference in Mathematical Statistics (Nordstat), Umeå, June 10-14, 2012
Ekström, Magnus
Tests based on sum-functions of spacings
Joint Statistical Meetings, San Diego, USA, July 28-August 2, 2012
Ekström, Magnus
A general measure of skewness
Statistics and Probability Letters, Elsevier 2012, Vol. 82, (8) : 1559-1568
Ekström, Magnus; Jammalamadaka, S. R.
Temporal variation in air pollution concentrations and preterm birth: a population based epidemiological study
International Journal of Environmental Research and Public Health, Basel: MDPI Publishing 2012, Vol. 9, (1) : 272-285
Olsson, David; Ekström, Magnus; Forsberg, Bertil
Addendum to “An asymptotically distribution-free test of symmetry” [Journal of Statistical Planning and Inference 137 (2007) 799–810]
Journal of Statistical Planning and Inference, Elsevier 2009, Vol. 139, (4) : 1569-1571
Ekström, Magnus; Jammalamadaka, S. R.
Alternatives to maximum likelihood estimation based on spacings and the Kullback-Leibler divergence
Journal of Statistical Planning and Inference, Elsevier 2008, Vol. 138, (6) : 1778-1791
Ekström, Magnus
Subsampling variance estimation for nonstationary spatial lattice data
Scandinavian Journal of Statistics, Wiley-Blackwell 2008, Vol. 35, (1) : 38-63
Ekström, Magnus
An asymptotically distribution-free test of symmetry
Journal of Statistical Planning and Inference, Vol. 137, (3) : 799-810
Ekström, Magnus; Jammalamadaka, S. Rao
Naturliga bakgrundshalter av bly, zink och arsenik i Svenska ytvatten baserat på metallernas haltvariation i morän och sedimentära jordar: implikationer för EU:s ramdirektiv för vatten och nationella miljömål
SGU Rapport, Nr 3 2007
Löfgren, Stefan; Ranneby, Bo; Ekström, Magnus; et al.
Unrestricted guided transect sampling for surveying sparse species
Canadian Journal of Forest Research, Canadian Science Publishing 2007, Vol. 37, (12) : 2575-2586
Ringvall, Anna; Snäll, Tord; Ekström, Magnus; et al.
Sum-functions of spacings of increasing order
Journal of Statistical Planning and Inference, Elsevier 2006, Vol. 136, (8) : 2535-2546
Ekström, Magnus
Subsampling methods to estimate the variance of sample means based on nonstationary spatial data with varying expected values
Journal of the American Statistical Association, Vol. 99, (465) : 82-95
Ekström, Magnus; Sjöstedt-de Luna, Sara
Quantifying spatial patterns of landscapes
Ambio, Vol. 32, (8) : 573-576
Ekström, Magnus
Multispectral image classification using wavelets: a simulation study
Pattern Recognition, Elsevier 2003, Vol. 36, (4) : 889-898
Yu, Jun; Ekström, Magnus
Nonparametric estimation of the variance of sample means based on nonstationary spatial data
Communications in Statistics - Theory and Methods, Marcel Dekker 2002, Vol. 31, (10) : 1743-1775
Ekström, Magnus
Consistency of generalized maximum spacing estimates
Scandinavian Journal of Statistics, Wiley-Blackwell 2001, Vol. 28, (2) : 343-354
Ekström, Magnus
Introducing gender in studies on management behaviour among non-industrial private forest owners
Scandinavian Journal of Forest Research, Vol. 15, (3) : 378-386
Lidestav, Gun; Ekström, Magnus
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