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Sökning: WFRF:(Karlström Anders) > (2000-2004)

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  • Ceccato, Vania, 1968-, et al. (författare)
  • A new information theoretical measure of global and local spatial association
  • 2002
  • Ingår i: The Review of Regional Research. - 0173-7600. ; 22:1, s. 13-40
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper a new measure of spatial association, the S statistics, is developed.The proposed measure is based on information theory by defininga spatially weighted information measure (entropy measure) that takes thespatial configuration into account. The proposed S-statistics has an intuitiveinterpretation, and furthermore fulfils properties that are expected from anentropy measure. Moreover, the S statistics is a global measure of spatialassociation that can be decomposed into Local Indicators of Spatial Association(LISA). This new measure is tested using a dataset of employmentin the culture sector that was attached to the wards over Stockholm Countyand later compared with the results from current global and local measuresof spatial association. It is shown that the proposed S statistics share manyproperties with Moran’s I and Getis-Ord Gi statistics. The local Si statisticsshowed significant spatial association similar to the Gi statistic, but has the advantage of being possible to aggregate to a global measure of spatialassociation. The statistics can also be extended to bivariate distributions.It is shown that the commonly used Bayesian empirical approach can beinterpreted as a Kullback-Leibler divergence measure. An advantage of Sstatisticsis that this measure select only the most robust clusters, eliminatingthe contribution of smaller ones composed by few observations and that mayinflate the global measure.
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  • Engdahl, Anders, et al. (författare)
  • The water-hydroxyl radical complex: A matrix isolation study.
  • 2003
  • Ingår i: Journal of Chemical Physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 118:17, s. 7797-7802
  • Tidskriftsartikel (refereegranskat)abstract
    • The water–hydroxyl radical complex was prepared by irradiating peroxy radicals in hydrogen-doped argon matrices. The low water content of the matrices made it possible to observe the fundamental bands of the complexed water molecule. The experimental results are compared with the results from ab initio calculations. The complex rotates around the O–O axis in the matrix. ©2003 American Institute of Physics.
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  • Karlström, Anders, et al. (författare)
  • A dynamic programming approach to model the retirement behaviour of blue-collar workers in Sweden
  • 2004
  • Ingår i: Journal of applied econometrics (Chichester, England). - : Wiley. - 0883-7252 .- 1099-1255. ; 19:6, s. 795-807
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper presents an empirical analysis of how Sweden's public old age pension system affects the retirement decision. We focus on male blue-collar workers whose dominant income source as retired comes from the public old age pension system. We develop a dynamic programming model using the rules for the public pension system. In addition to the effects of economic incentives through the pension systems the DP model also measures the effect of the mandatory retirement age of 65-which applies to most parts of Sweden's labour market-on retirement behaviour. The estimated model fits within-sample retirement patterns remarkably well. A simulation of a hypothetical reform, where all retirement incentives in the pension schemes are delayed by three years, shows that economic incentives affect retirement behaviour.
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