References of "Claustriaux, Jean-Jacques"
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See detailPetits producteurs - grands progrès : bilan de 10 années d'encadrement
Sindic, Marianne ULg; Belleflamme, Christel ULg; Corbisier, Patrice et al

Scientific conference (2006, January)

Application de la démarche qualité pour les premiers transformateurs agricoles.

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See detailUn regard sur les activités de l'unité de statistique et informatique de la Faculté Universitaire des Sciences agronomiques de Gembloux
Claustriaux, Jean-Jacques ULg

in Notes de Statistique et d'Informatique (2006), (1), 1-9

Analyse de l'évolution de la gestion d'un service universitaire dont le domaine de compétence est la statistique appliquée.

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See detailPrésentation de Monsieur L. Michel.
Claustriaux, Jean-Jacques ULg

Speech (2006)

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See detailContrôle statistique de l'hétérogénéité spatiale : application aux essais de provenances de pin d'Alep (Pinus halepensis Mill.) en Tunisie
Sghaier, Tahar; Claustriaux, Jean-Jacques ULg

Scientific conference (2006)

In 1964 – 1965, four long term trials were established in Tunisia to compare several origins of Aleppo pine (Pinus halepensis Mill.). Nearest neighbour models were used to control soil’s heterogeneity and ... [more ▼]

In 1964 – 1965, four long term trials were established in Tunisia to compare several origins of Aleppo pine (Pinus halepensis Mill.). Nearest neighbour models were used to control soil’s heterogeneity and to reduce experimental error unitil to 79 %. After adjustment of data, statistical methods are applied to choice origins for a reforestation program. [less ▲]

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See detailIntroduction au logiciel Minitab sous Windows
Carletti, Isabelle; Clissen, V.; Claustriaux, Jean-Jacques ULg

in Notes de Statistique et d'Informatique (2006), (2), 1-23

Principes de base pour utiliser le logiciel Minitab.

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See detailLa régression logistique binaire
Duyme, F.; Claustriaux, Jean-Jacques ULg

in Notes de Statistique et d'Informatique (2006), (4), 1-24

This note describes and illustrates the principles of binary logistic regression when predictors are continuous variables.

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See detailEtude longitudinale d'essais multilocaux: application à la comparaison d'un grand nombre d'objets
Brostaux, Yves ULg; Claustriaux, Jean-Jacques ULg

in Abdelguerfi, Aissa (Ed.) Workshop international "Diversité des fabacées fourragères et de leurs symbiotes: applications biotechnologiques, agronomiques et environnementales" (2006)

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See detailL’Observatoire de la Consommation alimentaire en Région wallonne : pourquoi, comment ?
Claustriaux, Jean-Jacques ULg; Cordier, Ludwig; Duquesne, Brigitte ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2005), 9(3), 207-212

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See detailAnalyse de la variance ou méthodes de transformation en rangs alignés : quelle méthode utiliser quand des conditions d'application ne sont pas rencontrées ?
Carletti, Isabelle; Claustriaux, Jean-Jacques ULg

in Bulletin USAMV-CN (2005), 62

Normality and homocedsticity of populations are the main assumptions to use analysis of variance. Il these assumptions are not fulfilled, alternatives are rank transform and aligned rank transform methods ... [more ▼]

Normality and homocedsticity of populations are the main assumptions to use analysis of variance. Il these assumptions are not fulfilled, alternatives are rank transform and aligned rank transform methods. To compare these methods, simulations have been conducted for study robustness properties of analysis of variance and aligned rank methods applied to two-fixed effects layouts in condition of non-normality or unequal variance. The results showed that aligned rank transform methods are more affected by unequal variances than analysis of variance especially when sample sizes are large. When variances are equal, these methods are theoretically robust to non normality but in practice when a normality pre-test rejects normality assumption, these methods are also not advised. [less ▲]

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See detailQualité de validation des modèles de régression logisitique binaire
Duyme, F.; Claustriaux, Jean-Jacques ULg; Daudin, J.-J.

in Revue de Statistique Appliquée (2005), LIII(3), 91-102

In this paper, we summarize a study of the quality of validation given by binary logistic regression models. We have studied the effect of the proportion of events (ie proportion of individuals having the ... [more ▼]

In this paper, we summarize a study of the quality of validation given by binary logistic regression models. We have studied the effect of the proportion of events (ie proportion of individuals having the code 1) and the way of using data for selecting variables and fitting a model. In particular, we show the interest of leading those two steps separately or not. Artificial data were used to carry out this study. We show that proportion of events influences the quality of the models. Especially, this effect is great when the proportion is very low (5% in our study). We also meet problems like non-convergence of the algorithm when trying to fit a model. However, quality is much better when a proportion equal to 25% or 50% is used. For the latter one, precision of the estimations is even a little bit better and the others studied factors have no effect. The simulations also show that separating selection and fitting is not an interesting strategy because we never obtain a good quality. Difference of quality is however close to 10 per cent. [less ▲]

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See detailLa statistique dans les pays en développement : regard et perspective
Claustriaux, Jean-Jacques ULg

in Bulletin des séances ARSOM-KAOW (2005), 3

In the context of developing countries, notably in the field of agronomical research, the author suggests some answers to the following questions : is there a specificity in statistics ? What is its ... [more ▼]

In the context of developing countries, notably in the field of agronomical research, the author suggests some answers to the following questions : is there a specificity in statistics ? What is its influence ? How to increase its field impact ? [less ▲]

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See detailObservatory of food consumption in Walloon Region (Belgium).
Bievelet, C.; Palm, Rodolphe ULg; Claustriaux, Jean-Jacques ULg

Scientific conference (2005)

This paper describes tasks entrusted to the Gembloux Agricultural University in the context of the Observatory of Food Consumption. At first, the document presents the establishment and the targets of ... [more ▼]

This paper describes tasks entrusted to the Gembloux Agricultural University in the context of the Observatory of Food Consumption. At first, the document presents the establishment and the targets of this organism. The database available, a consumption panel, is then described. Finally, some results, from studies carried out on the "structure of consumption", illustrate the use of the database. [less ▲]

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See detailLes productions animales en Région wallonne, d’une économie de l’offre à une économie de la demande
Lebailly, Philippe ULg; Claustriaux, Jean-Jacques ULg; Duquesne, Brigitte ULg

in 10ème Carrefour des Productions animales : L’élevage : hier, aujourd’hui, demain quelles attentes pour quels enjeux ? (2005)

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See detailNew Model For Performance Prediction In Fixed-Bed Reactors Based On The Approach Of The Unused Bed Zone
Fanfan, Pierre Naïder; Mabon, Nicolas; Carletti, Isabelle et al

in Water Research (2005), 39(16), 4004-4010

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See detailIntérêt des modèles des plus proches voisins pour le contrôle de l'hétérogénéité spatiale : application à un essai de provenances de pin d'Alep (pinus halepensis mill.) en Tunisie
Sghaier, T.; Claustriaux, Jean-Jacques ULg; Beji, A.

in Revue de l'I.N.A.T. (2004), 19(2), 5-22

To study the importance of the spatial analysis in the control of soil heterogeneity in experiment on field, three approaches of statistical analysis were applied to a total height of trees measured at 29 ... [more ▼]

To study the importance of the spatial analysis in the control of soil heterogeneity in experiment on field, three approaches of statistical analysis were applied to a total height of trees measured at 29 years of age in a comparative test of thirty origins of Aleppo pine (Pinus halepensis Mill.), autochtonous and introduced in Tunisia. Analysis without control of heterogeneity (totally random), with a global control of heterogeneity (complete blocks) and with a local control of heterogeneity (nearest neighbour models) were used. For this last approach using to estimate the plot fertility the one of the nearby plots, various combinations of neighbour were tested with one or two coefficients of regression. The obtained results showed that the reduction of the residual mean square by comparison to the analysis without control of heterogeneity is 30 % to the complete blocks analysis and varied between 66 and 79 % for spatial analysis. Significant positive correlations between plots residues and the average of the residues of the nearby plots were observed before adjustment of data. After adjustment of data by the nearest neighbour models, these correlations were registered a reduction from 92 to 95 % according to the used model. Among the six nearest neighbour models studied, the model bringing in eight neighbours with two coefficients of regression showed itself the most effective. It also seemed that after adjustment of data by nearest neighbour models, using the structure of blocks does not produce a reduction of the residual mean square. [less ▲]

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See detailUn homme, une vocation
Claustriaux, Jean-Jacques ULg; Nuyt, Cécile

in Echosud (2004), 5

Quelles sont les raisons pour lesquelles un universitaire s'intéresse aux pays du Sud ?

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See detailL'Observatoire de la Consommation Alimentaire en Région Wallonne : pourquoi, comment ?
Claustriaux, Jean-Jacques ULg; Cordier, L.; Duquesne, B. et al

Conference (2004, May 12)

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See detailL'Observatoire de la consommation alimentaire
Claustriaux, Jean-Jacques ULg; Cordier, L.; Duquesne, B. et al

in Vers une politique de qualité, à quel prix ? (2003, October 08)

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See detailDescription et modélisation de la croissance et du développement du pommier (Malus x domestica Borkh.) : I. Structure la plus probable de l'arbre jeune
Planchon, Viviane; Claustriaux, Jean-Jacques ULg; Crabbé, Jacques

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2003), 7(1), 37-49

Growth and development of young apple trees are described and modeled from four years of observations.

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