La représentation d'une matrice par biplot

in Notes de Statistique et d'Informatique (2012), (2), 1-22

Matrix factorization by means of singular value decomposition is examined and used to produce a graphical representation of a data matrix called biplot. The link between this biplot and the plots of the ... [more ▼]

Matrix factorization by means of singular value decomposition is examined and used to produce a graphical representation of a data matrix called biplot. The link between this biplot and the plots of the variables and of the individuals usually given in principal component analysis is discussed and applied to an example. [less ▲]

La régression logistique avec Minitab

in Notes de Statistique et d'Informatique (2011), (4), 15

This note describes the Minitab commands BLOGISTIC, NLOGISTIC and OLOGISTIC and proposes a macro, which can be downloaded, for coding the data in order to fit the continuation-ratio logits model. The ... [more ▼]

This note describes the Minitab commands BLOGISTIC, NLOGISTIC and OLOGISTIC and proposes a macro, which can be downloaded, for coding the data in order to fit the continuation-ratio logits model. The commands are illustrated by an example. [less ▲]

Macros Minitab pour le choix d'une transformation pour la normalisation de variables

in Notes de Statistique et d'Informatique (2011), (3),

Macros are proposed to Minitab users for transforming data to normality. The following transformations are examined : log transformation, Box et Cox transformation with lambda equal to -2, -1, -0,5, 0,5 ... [more ▼]

Macros are proposed to Minitab users for transforming data to normality. The following transformations are examined : log transformation, Box et Cox transformation with lambda equal to -2, -1, -0,5, 0,5 and 2, Box et Cox transformation with maximum likelihood estimation of lambda and transformations using the Johnson system of distributions. Two examples are given. [less ▲]

Détermination de la répétabilité et de la reproductibilité d'une méthode de mesure normalisée selon la norme ISO 5725-2

in Notes de Statistique et d'Informatique (2008), (1), 1-22

This note describes the statistical aspects related to the norm ISO 5725-2 for the estimation of repeatability and reproducibility of a standard measurement method. The procedure is then applied t a real ... [more ▼]

This note describes the statistical aspects related to the norm ISO 5725-2 for the estimation of repeatability and reproducibility of a standard measurement method. The procedure is then applied t a real world example related to the measurement of land parcel areas by remote sensing. [less ▲]

Etude des séries chronologiques par les méthodes de lissage

in Notes de Statistique et d'Informatique (2007), (1), 1-22

This note briefly describes forecasting procedures for time series based on smoothing techniques. The following procedures are examined : exponential smoothing for non-seasonal time series showing no ... [more ▼]

This note briefly describes forecasting procedures for time series based on smoothing techniques. The following procedures are examined : exponential smoothing for non-seasonal time series showing no trend, Holt procedure for non-seasonal time series with trend and Holt-Winters procedure for time series containing trend and seasonal variation. The methods are illustrated by an example processed with Minitab software. [less ▲]

Introduction au logiciel Minitab sous Windows

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

Principes de base pour utiliser le logiciel Minitab.

Le positionnement multidimensionnel : principes et applications

in Notes de Statistique et d'Informatique (2003), (1), 1-32

This note describes some multidimensional scaling methods for two-way, one-mode tables and for three-way, two-mode tables. The methods are illustrated by an example processed by PROC MDS of SAS software.

Conditions d'application et transformations de variables en régression linéaire

in Notes de Statistique et d'Informatique (2002), (1), 1-34

This note first reviews methods used for checking the assumptions in linear regression (lack of fit, normality, homoscedasticity and independance of the residuals) and then describes variables ... [more ▼]

This note first reviews methods used for checking the assumptions in linear regression (lack of fit, normality, homoscedasticity and independance of the residuals) and then describes variables transformations as remedial action when the assumptions are not fulfilled. [less ▲]

A propos des qualificatifs complet, orthogonal et équilibré en analyse de la variance.

in Notes de Statistique et d'Informatique (1999), (2), 15

With examples, we introduce the words complete, orhtogonal and balanced used in analysis of variance.

L'analyse discriminante décisionnelle : principes et application

in Notes de Statistique et d'Informatique (1999), (4), 41

The principles of discriminant analysis are described and illustrated by the iris data set published by Fisher [1936].