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Publikationer (10 of 14) Visa alla publikationer
Fredman, P. & Wikström, D. (2018). Income elasticity of demand for tourism at Fulufjället National Park. Tourism Economics, 24(1), 51-63
Öppna denna publikation i ny flik eller fönster >>Income elasticity of demand for tourism at Fulufjället National Park
2018 (Engelska)Ingår i: Tourism Economics, ISSN 1354-8166, E-ISSN 2044-0375, Vol. 24, nr 1, s. 51-63Artikel i tidskrift (Refereegranskat) Published
Nationell ämneskategori
Övrig annan samhällsvetenskap
Forskningsämne
Komplexa system - mikrodataanalys
Identifikatorer
urn:nbn:se:du-27110 (URN)10.1177/1354816617724012 (DOI)000426013200004 ()2-s2.0-85040834509 (Scopus ID)
Tillgänglig från: 2018-02-05 Skapad: 2018-02-05 Senast uppdaterad: 2018-03-19Bibliografiskt granskad
Wikström, D., Brandt, D. & Heldt, T. (2016). A business intelligence solution of handling traveling data with R and Shiny. In: Fuchs, M., Lexhagen, M. & Höpken, W. (Ed.), Proceedings of the IFITTtalk@Östersund Workshop on Big Data & Business Intelligence in the Travel & Tourism Domain: . Paper presented at IFITTtalk@Östersund on Big Data & Business Intelligence in Travel & Tourism Domain, Östersund, Sweden, April 11-12, 2016.
Öppna denna publikation i ny flik eller fönster >>A business intelligence solution of handling traveling data with R and Shiny
2016 (Engelska)Ingår i: Proceedings of the IFITTtalk@Östersund Workshop on Big Data & Business Intelligence in the Travel & Tourism Domain / [ed] Fuchs, M., Lexhagen, M. & Höpken, W., 2016Konferensbidrag, Publicerat paper (Refereegranskat)
Nationell ämneskategori
Systemvetenskap, informationssystem och informatik
Forskningsämne
Komplexa system - mikrodataanalys
Identifikatorer
urn:nbn:se:du-23617 (URN)978-91-88025-62-3 (ISBN)
Konferens
IFITTtalk@Östersund on Big Data & Business Intelligence in Travel & Tourism Domain, Östersund, Sweden, April 11-12, 2016
Tillgänglig från: 2016-12-19 Skapad: 2016-12-19 Senast uppdaterad: 2018-01-13Bibliografiskt granskad
Wikström, D. (2016). Modified fixed effects estimation of technical inefficiency. Journal of Productivity Analysis, 46(1), 83-86
Öppna denna publikation i ny flik eller fönster >>Modified fixed effects estimation of technical inefficiency
2016 (Engelska)Ingår i: Journal of Productivity Analysis, ISSN 0895-562X, E-ISSN 1573-0441, Vol. 46, nr 1, s. 83-86Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We consider method-of-moments fixed effects (FE) estimation of technical inefficiency. When dealing with a large number of cross-sectional observations, N, it is possible to obtain consistent moment estimators of the inefficiency distribution. It is well known that the classical FE estimator may be seriously upward biased when N is large and T, the number of time observations, is small. The method-of-moments FE estimators do not suffer from this type of bias in large-N settings. The proposed methodology bridges classical FE and maximum likelihood estimation, leading to a reduction in bias without making the random effects assumption.

Nyckelord
Technical inefficiency, Fixed effects estimator, Method of moments
Nationell ämneskategori
Företagsekonomi
Forskningsämne
Komplexa system - mikrodataanalys
Identifikatorer
urn:nbn:se:du-22663 (URN)10.1007/s11123-016-0473-3 (DOI)000379172500006 ()
Tillgänglig från: 2016-08-03 Skapad: 2016-08-03 Senast uppdaterad: 2017-11-28Bibliografiskt granskad
Brandt, D., Heldt, T. & Wikström, D. (2016). Potential research areas for big data in tourism. In: Fuchs, M., Lexhagen, M. & Höpken, W. (Ed.), Proceedings of the IFITTtalk@Östersund Workshop on Big Data & Business Intelligence in the Travel & Tourism Domain: . Paper presented at IFITTtalk@Östersund on Big Data & Business Intelligence in Travel & Tourism Domain. Östersund, Sweden, April 11-12, 2016.
Öppna denna publikation i ny flik eller fönster >>Potential research areas for big data in tourism
2016 (Engelska)Ingår i: Proceedings of the IFITTtalk@Östersund Workshop on Big Data & Business Intelligence in the Travel & Tourism Domain / [ed] Fuchs, M., Lexhagen, M. & Höpken, W., 2016Konferensbidrag, Publicerat paper (Refereegranskat)
Nyckelord
Business Intelligence, Big Data, Tourism
Nationell ämneskategori
Systemvetenskap, informationssystem och informatik
Forskningsämne
Komplexa system - mikrodataanalys, Allmänt Mikrodataaanalys - turism
Identifikatorer
urn:nbn:se:du-23616 (URN)978-91-88025-62-3 (ISBN)
Konferens
IFITTtalk@Östersund on Big Data & Business Intelligence in Travel & Tourism Domain. Östersund, Sweden, April 11-12, 2016
Tillgänglig från: 2016-12-19 Skapad: 2016-12-19 Senast uppdaterad: 2018-01-13Bibliografiskt granskad
Wikström, D. (2015). A finite sample improvement of the fixed effects estimator applied to technical inefficiency. Journal of Productivity Analysis, 43(1), 29-46
Öppna denna publikation i ny flik eller fönster >>A finite sample improvement of the fixed effects estimator applied to technical inefficiency
2015 (Engelska)Ingår i: Journal of Productivity Analysis, ISSN 0895-562X, E-ISSN 1573-0441, Vol. 43, nr 1, s. 29-46Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The fixed effects (‘FE’) estimator of technical inefficiency performs poorly when N (the ’number of firms’) is large and T (the ‘number of time observations’) is small. We propose kernel estimators, which includes the FE estimator as a special case. In terms of criteria based on collective conditional ‘mean square error’, it is demonstrated that some kernel estimators are more efficient than the FE estimators of firm effects and inefficiencies in finite sample settings. Monte Carlo simulations support our theoretical findings, and we use an empirical example to show how FE estimation and kernel estimation lead to very different conclusions about technical inefficiency among Indonesian rice farmers.

Nyckelord
Econometrics, Technical output inefficiency, Panel data
Nationell ämneskategori
Nationalekonomi
Forskningsämne
Komplexa system - mikrodataanalys, Allmänt Mikrodataaanalys - metod
Identifikatorer
urn:nbn:se:du-16684 (URN)10.1007/s11123-014-0424-9 (DOI)
Tillgänglig från: 2015-01-14 Skapad: 2015-01-14 Senast uppdaterad: 2017-12-05Bibliografiskt granskad
Wikström, D. (2015). A Note on Proxy Variables and Instrument Variable Regression. Borlänge: Högskolan Dalarna
Öppna denna publikation i ny flik eller fönster >>A Note on Proxy Variables and Instrument Variable Regression
2015 (Engelska)Rapport (Övrigt vetenskapligt)
Abstract [en]

This is a note about proxy variables and instruments for identification of structural parameters in regression models. We have experienced that in the econometric textbooks these two issues are treated separately, although in practice these two concepts are very often combined. Usually, proxy variables are inserted in instrument variable regressions with the motivation they are exogenous. Implicitly meaning they are exogenous in a reduced form model and not in a structural model. Actually if these variables are exogenous they should be redundant in the structural model, e.g. IQ as a proxy for ability. Valid proxies reduce unexplained variation and increases the efficiency of the estimator of the structural parameter of interest. This is especially important in situations when the instrument is weak. With a simple example we demonstrate what is required of a proxy and an instrument when they are combined. It turns out that when a researcher has a valid instrument the requirements on the proxy variable is weaker than if no such instrument exists

Ort, förlag, år, upplaga, sidor
Borlänge: Högskolan Dalarna, 2015
Serie
Working papers in transport, tourism, information technology and microdata analysis, ISSN 1650-5581 ; 2015:04
Nyckelord
Instrument variable regression, Proxy variables
Nationell ämneskategori
Sannolikhetsteori och statistik
Forskningsämne
Komplexa system - mikrodataanalys
Identifikatorer
urn:nbn:se:du-17295 (URN)
Tillgänglig från: 2015-04-16 Skapad: 2015-04-16 Senast uppdaterad: 2017-08-25Bibliografiskt granskad
Fredman, P. & Wikström, D. (2015). Besök och besökare i Fulufjällets nationalpark sommaren 2014 (med jämförelser åren 2001 och 2003). Östersund: Mittuniversitetet
Öppna denna publikation i ny flik eller fönster >>Besök och besökare i Fulufjällets nationalpark sommaren 2014 (med jämförelser åren 2001 och 2003)
2015 (Svenska)Rapport (Övrigt vetenskapligt)
Ort, förlag, år, upplaga, sidor
Östersund: Mittuniversitetet, 2015. s. 120
Serie
ETOUR Rapport ; 2015:5
Nationell ämneskategori
Annan samhällsvetenskap
Forskningsämne
Komplexa system - mikrodataanalys
Identifikatorer
urn:nbn:se:du-19980 (URN)978-91-88025-44-9 (ISBN)
Tillgänglig från: 2015-11-11 Skapad: 2015-11-11 Senast uppdaterad: 2015-11-11Bibliografiskt granskad
Wikström, D. (2015). Consistent method of moments estimation of the true fixed effects model. Borlänge: Högskolan Dalarna
Öppna denna publikation i ny flik eller fönster >>Consistent method of moments estimation of the true fixed effects model
2015 (Engelska)Rapport (Övrigt vetenskapligt)
Ort, förlag, år, upplaga, sidor
Borlänge: Högskolan Dalarna, 2015
Serie
Working papers in transport, tourism, information technology and microdata analysis, ISSN 1650-5581 ; 2015:05
Nyckelord
Stochastic frontier, Fixed effects, Panel data, Method of moments
Nationell ämneskategori
Nationalekonomi Sannolikhetsteori och statistik
Forskningsämne
Komplexa system - mikrodataanalys
Identifikatorer
urn:nbn:se:du-17339 (URN)
Tillgänglig från: 2015-04-30 Skapad: 2015-04-30 Senast uppdaterad: 2015-05-05Bibliografiskt granskad
Wikström, D. (2015). Consistent method of moments estimation of the true fixed effects model. Economics Letters, 137, 62-69
Öppna denna publikation i ny flik eller fönster >>Consistent method of moments estimation of the true fixed effects model
2015 (Engelska)Ingår i: Economics Letters, ISSN 0165-1765, E-ISSN 1873-7374, Vol. 137, s. 62-69Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

About a decade ago William H. Greene introduced the so-called ‘True fixed effects’ (TFE) model, which is intended to discriminate between heterogeneity and efficiency in stochastic frontier analysis. We would say that the TFE model has had a huge impact on applied stochastic frontier analysis. One problem with the original TFE estimator, is its inconsistency in cases with finite time observations, at least for the variance components. For the normal-half-normal model, this problem was solved by Chen et al. (2014) based on maximum likelihood estimation of the within-transformed model. In this study, we illustrate the possibilities offered by method of moments estimation. This approach is more flexible than the MLE proposed by Chen et al. (2014), since the method of moments estimators are not so closely dependent on the distributional assumptions and do not hinge on an explicit distribution of the random error. We only assume symmetry, as well as a fixed fourth-order cumulant for more complicated models. Greene’s methodology can, and has been, generalized to other models than the normal-half-normal model. However, the method of moments estimators proposed here are consistent.

Ort, förlag, år, upplaga, sidor
Elsevier, 2015
Nyckelord
stochastic frontier; fixed effects; panel data; method of moments
Nationell ämneskategori
Nationalekonomi Sannolikhetsteori och statistik
Forskningsämne
Komplexa system - mikrodataanalys
Identifikatorer
urn:nbn:se:du-19966 (URN)10.1016/j.econlet.2015.08.036 (DOI)000367492000016 ()
Tillgänglig från: 2015-11-10 Skapad: 2015-11-10 Senast uppdaterad: 2017-12-01Bibliografiskt granskad
Brandt, D. & Wikström, D. (2015). Education and careers in the Swedish tourism sector: How important is education for building a successful career?. In: : . Paper presented at 24th Nordic Symposium of Tourism and Hospitality Research. Responsible tourism? Reykjavik, Island 1-3 oktober 2015.
Öppna denna publikation i ny flik eller fönster >>Education and careers in the Swedish tourism sector: How important is education for building a successful career?
2015 (Engelska)Konferensbidrag, Muntlig presentation med publicerat abstract (Refereegranskat)
Nationell ämneskategori
Kulturgeografi
Forskningsämne
Komplexa system - mikrodataanalys
Identifikatorer
urn:nbn:se:du-20459 (URN)
Konferens
24th Nordic Symposium of Tourism and Hospitality Research. Responsible tourism? Reykjavik, Island 1-3 oktober 2015
Tillgänglig från: 2015-12-18 Skapad: 2015-12-18 Senast uppdaterad: 2016-12-20Bibliografiskt granskad
Organisationer
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0003-4378-9593

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