References of "Lejeune, Bernard"
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See detailEvaluation du Plan d'Accompagnement des Chômeurs en Région Wallonne
Fonder, Muriel; Lejeune, Bernard ULg

Conference (2011, February 24)

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See detailEconométrie I
Lejeune, Bernard ULg

Learning material (2011)

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See detailA diagnostic m-test for distributional specification of parametric conditional heteroscedasticity models for financial data
Lejeune, Bernard ULg

in Journal of Empirical Finance (2009), 16(3), 507-523

This paper proposes a convenient and generally applicable diagnostic m-test for checking the distributional specification of parametric conditional heteroscedasticity models for financial data such as the ... [more ▼]

This paper proposes a convenient and generally applicable diagnostic m-test for checking the distributional specification of parametric conditional heteroscedasticity models for financial data such as the customary Student t GARCH model. The proposed test is based on the moments of the probability integral transform of the innovations of the assumed model. Monte-Carlo evidence indicates that our test performs well both in terms of size and power. An empirical example illustrates the practical usefulness of the test and some of its possible extensions are outlined. [less ▲]

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See detailDo monitoring and counselling boost the job finding rates of the long-term unemployed ?
Fonder, Muriel; Lejeune, Bernard ULg

Conference (2008, June 13)

In July 2004, the Belgian government launched a new monitoring and counselling program targeted at the long-term unemployed. In this new program, people over 13 months unemployment are warned that their ... [more ▼]

In July 2004, the Belgian government launched a new monitoring and counselling program targeted at the long-term unemployed. In this new program, people over 13 months unemployment are warned that their job-search efforts will be monitored 8 months later. At the same time, they are invited to participate actively in the support (job search, training) programs provided for by the Regional Employment Agencies, whose supply was expanded. This reform has been implemented gradually : it focused the unemployed under 30 years in 2004, then the 30-40 year-old unemployed in 2005, and finally the 40-50 year-old unemployed in 2006. This paper aims at evaluate the effect, in terms of transition from unemployment to employment and/or training, of this new program for the 30-40 years old in Wallonia. Using the fact that the reform was implemented gradually, the effect of the program is estimated by difference-in-differences, based on (single exit and two exits) discrete duration models. The results suggest that the program has had a very large relative effect, although limited in absolute terms, regarding transition to training for almost all the treated unemployed. They also show that the program has had a substantial relative effect, although limited in absolute terms as well, with regard to transition to employment for the majority of the treated unemployed. [less ▲]

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See detailAccompagnement et Contrôle des Chômeurs de Longue Durée en Wallonie: Evaluation d'un Nouveau Dispositif
Fonder, Muriel; Lejeune, Bernard ULg

Conference (2007, May 31)

En juillet 2004, le gouvernement fédéral belge lançait un nouveau dispositif d’accompagnement et de contrôle des chômeurs de longue durée. Ce nouveau dispositif allie un renforcement des actions ... [more ▼]

En juillet 2004, le gouvernement fédéral belge lançait un nouveau dispositif d’accompagnement et de contrôle des chômeurs de longue durée. Ce nouveau dispositif allie un renforcement des actions d’accompagnement (aide à la recherche d’emploi et offre de formations) à un système de contrôle basé sur la convocation des chômeurs à un ou plusieurs entretien(s) visant à vérifier et stimuler leur recherche d’emploi, la convocation au premier entretien étant précédée d’une lettre d’avertissement. S’appuyant sur un échantillon de plus de 90.000 demandeurs d’emploi wallons (la région francophone de Belgique), l’objet de ce papier est d’évaluer si ce nouveau dispositif a permis d’améliorer l’accès à l’emploi ou à une formation des chômeurs, par rapport à ce qui ce serait passé en son absence. L’effet du dispositif est évalué au travers de modèles de durée discrets et est estimé par double différence, sur base de l’observation de trajectoires individuelles avant et après la mise en place du dispositif, pour le population cible du dispositif et pour une population de contrôle. Les résultats montrent que le dispositif a eu un effet relatif substantiel, bien que limité en termes absolus, sur l’accès à une formation de la majorité des chômeurs ciblés. Les résultats sont plus décevants en ce qui concerne l’accès à l’emploi, pour lequel une amélioration relativement plus modeste n’est observée que pour une minorité des chômeurs ciblés. [less ▲]

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See detailA full heteroscedastic one-way error components model: Pseudo-maximum likelihood estimation and specification testing
Lejeune, Bernard ULg

in Baltagi, Badi H. (Ed.) Panel Data Econometrics: Theoretical Contributions and Empirical Applications (2006)

This paper proposes an extension of the standard one-way error components model allowing for heteroscedasticity in both the individual-specific and the general error terms, as well as for unbalanced panel ... [more ▼]

This paper proposes an extension of the standard one-way error components model allowing for heteroscedasticity in both the individual-specific and the general error terms, as well as for unbalanced panel. On the grounds of its computational convenience, its potential efficiency, its robustness to non-normality and its robustness to possible misspecification of the assumed scedastic structure of the data, we argue for estimating this model by Gaussian pseudo-maximum likelihood of order two. Further, we review how, taking advantage of the powerful m-testing framework, the correct specification of the prominent aspects of the model may be tested. We survey potentially useful nested, non-nested, Hausman and information matrix type diagnostic tests of both the mean and the variance specification of the model. Finally, we illustrate the usefulness of our proposed model and estimation and diagnostic testing procedures through an empirical example. [less ▲]

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See detailThe effect of youth employment quotas on the job finding rates of young people in Wallonia
Fonder, Muriel; Lejeune, Bernard ULg

Conference (2005, May 26)

In april 2000, the Belgian federal government launched a special labor market program, whose prominent characteristic was the obligation for companies to occupy in their labor force a certain quota of ... [more ▼]

In april 2000, the Belgian federal government launched a special labor market program, whose prominent characteristic was the obligation for companies to occupy in their labor force a certain quota of young people. Based on a sample of more 100,000 young Walloon job seekers (Wallonia is the French-speaking region of Belgium), the aim of this paper is to evaluate whether or not this program has really improved the youth insertion in the labour market, compared to what would have prevailed in the absence of the program. The effect of the program is evaluated through discrete duration models, and estimated by ‘difference in differences’, looking at the individual trajectory on the labor market of young job seekers, before and after the setting up of the program, for the program target group and for a control group. The empirical results show that the program had a modest positive effect for mid-skilled job seekers, but very little effect for unskilled job seekers. On the other hand, as it could be expected, a strong deadweight effect is observed for the skilled young job seekers. [less ▲]

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See detailThe effect of youth employment quotas on the job finding rates of young people in Belgian
Fonder, Muriel; Lejeune, Bernard ULg

Conference (2004, May 17)

In april 2000, the Belgian federal government launched a special labor market program, whose prominent characteristic was the obligation for companies to occupy in their labor force a certain quota of ... [more ▼]

In april 2000, the Belgian federal government launched a special labor market program, whose prominent characteristic was the obligation for companies to occupy in their labor force a certain quota of young people. Based on a sample of more 100,000 young Walloon job seekers (Wallonia is the French-speaking region of Belgium), the aim of this paper is to evaluate whether or not this program has really improved the youth insertion in the labour market, compared to what would have prevailed in the absence of the program. The effect of the program is evaluated through discrete duration models, and estimated by ‘difference in differences’, looking at the individual trajectory on the labor market of young job seekers, before and after the setting up of the program, for the program target group and for a control group. The empirical results show that the program had a modest positive effect for mid-skilled job seekers, but very little effect for unskilled job seekers. On the other hand, as it could be expected, a strong deadweight effect is observed for the skilled young job seekers. [less ▲]

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See detailEvaluation de la Convention Premier Emploi - Analyse économique
Bay, Christelle; Fonder, Muriel; Lejeune, Bernard ULg et al

Report (2003)

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See detailA diagnostic m-test for distributional specification of parametric conditional heteroscedasticity models for financial data
Lejeune, Bernard ULg

Conference (2002, August 26)

This paper proposes a convenient and generally applicable diagnostic m-test for checking the distributional specification of parametric conditional heteroscedasticity models for financial data such as the ... [more ▼]

This paper proposes a convenient and generally applicable diagnostic m-test for checking the distributional specification of parametric conditional heteroscedasticity models for financial data such as the customary student-t GARCH Model. The proposed test is based on the moments of the probability integral transform of the estimated innovations of the assumed model. Monte-Carlo evidence indicates that our suggested test performs well both in terms of size and power. [less ▲]

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See detailA diagnostic m-test for distributional specification of parametric conditional heteroscedasticity models for financial data
Lejeune, Bernard ULg

Conference (2002, June 06)

This paper proposes a convenient and generally applicable diagnostic m-test for checking the distributional specification of parametric conditional heteroscedasticity models for financial data such as the ... [more ▼]

This paper proposes a convenient and generally applicable diagnostic m-test for checking the distributional specification of parametric conditional heteroscedasticity models for financial data such as the customary Student t GARCH model. The proposed test is based on the moments of the probability integral transform of the innovations of the assumed model. Monte-Carlo evidence indicates that our suggested test performs well both in terms of size and power. [less ▲]

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See detailA distribution-free joint test and one-directional robust tests for random individual effects and heteroscedasticity allowing for unbalanced panels
Lejeune, Bernard ULg

Conference (1999, August 29)

This paper proposes a convenient testing procedure designed for detecting, from preliminary (pooled) OLS estimation of the model, the possible simultaneous presence of indivi-dual effects and ... [more ▼]

This paper proposes a convenient testing procedure designed for detecting, from preliminary (pooled) OLS estimation of the model, the possible simultaneous presence of indivi-dual effects and heteroscedasticity in the error of a linear panel data regression model. The proposed testing procedure consists in (1) a distribution-free and allowing for unbalanced panel joint pseudo-LM test of the null of no individual effect and no heteroscedasticity and (2) a BMCP based on distribution-free and again allowing for unbalanced panel robust one-directional pseudo-LM tests for identifying the source(s) of departure from the joint null when it is rejected. An empirical example illustrates the usefulness of the testing procedure. [less ▲]

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See detailA distribution-free joint test for random individual effects and heteroscedasticity allowing for incomplete panels
Lejeune, Bernard ULg

Conference (1999, June 04)

This paper proposes a convenient testing procedure designed for detecting, from preliminary (pooled) OLS estimation of the model, the possible simultaneous presence of individual effects and ... [more ▼]

This paper proposes a convenient testing procedure designed for detecting, from preliminary (pooled) OLS estimation of the model, the possible simultaneous presence of individual effects and heteroscedasticity in the error of a linear panel data regression model. The proposed testing procedure consists in (1) a distribution-free and allowing for unbalanced panel joint pseudo-LM test of the null of no individual effect and no heteroscedasticity and (2) a BMCP based on distribution-free and again allowing for unbalanced panel robust one-directional pseudo-LM tests for identifying the source(s) of departure from the joint null when it is rejected. An empirical example illustrates the usefulness of the testing procedure. [less ▲]

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See detailCoût dans le secteur de la distribution d’électricité : économies d’échelle, économies de densité et formes institutionnelles
Evrard, Olivier; Lejeune, Bernard ULg

in Economie et Prévision (1998), 135

Cet article a pour objet d'évaluer empiriquement la pertinence économique (en termes d'efficience-coût) de la politique de délégation de la distribution d'électricité des communes vers des organismes ou ... [more ▼]

Cet article a pour objet d'évaluer empiriquement la pertinence économique (en termes d'efficience-coût) de la politique de délégation de la distribution d'électricité des communes vers des organismes ou sociétés extra-communales. Pour ce faire, les possibilités d'économies d'échelle et de densité au sein du secteur ainsi que les coûts d'exploitation relatifs des diverses formes institutionnelles existantes sont évalués sur base de l'estimation d'une fonction de coût hédonique à court terme. [less ▲]

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See detailSecond order pseudo-maximum likelihood estimation and conditional variance misspecification
Lejeune, Bernard ULg

Conference (1997, August 27)

In this paper, we study the behavior of second order pseudo-maximum likelihood estimators under conditional variance misspecification. We determine sufficient and essentially necessary conditions for such ... [more ▼]

In this paper, we study the behavior of second order pseudo-maximum likelihood estimators under conditional variance misspecification. We determine sufficient and essentially necessary conditions for such a estimator to be, regardless of the conditional variance (mis)specification, consistent for the mean parameters when the conditional mean is correctly specified. These conditions implie that, even if mean and variance parameters vary independently, standard PML2 estimators are generally not robust to conditional variance misspecification. Further, we outline sufficient and essentially necessary conditions for a second order pseudo-maximum likelihood estimator to be consistent for both mean and variance parameters when the conditional mean and the conditional variance are jointly correctly specified, and to remain consistent for the mean parameters when the conditional mean is correctly specified but the conditional variance is not jointly correctly specified. Finally, we provide limiting distribution results for this latter robust to conditional variance misspecification class of estimators under different assumptions regarding the degree of misspecification present in the model, show that its asymptotic covariance matrix is bounded and compare its similarities with QGPML1. [less ▲]

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See detailOrigine sociale et réussite scolaire : un modèle en Chaîne de Markov estimé sur données individuelles belges
Donni, Olivier; Lejeune, Bernard ULg

in Recherches Economiques de Louvain (1997), 63(4), 421-446

Cet article étudie les relations entre l'origine socio-économique des élèves belges et leur parcours scolaire primaire et secondaire. Il repose sur l'hypothèse que le parcours scolaire des élèves peut ... [more ▼]

Cet article étudie les relations entre l'origine socio-économique des élèves belges et leur parcours scolaire primaire et secondaire. Il repose sur l'hypothèse que le parcours scolaire des élèves peut être décrit par un processus de Markov. Sur la base d'un échantillon transversal d'un millier d'enfants, en fonction de variables socio-économiques et pour chacune des années de scolarité obligatoire, les probabilités individuelles de poursuivre un parcours scolaire ''normal'', c.-à-d. sans redoublement ni relégation dans une filière de second choix, sont estimées. Nos résultats montrent que derrière les substantiels taux agrégés de redoublement qui caractérisent le système scolaire belge se cachent en fait de profondes inégalités sociales. [less ▲]

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