GDAtools

Geometric Data Analysis and other descriptive techniques

GDAtools provides functions for Geometric Data Analysis :

• specific Multiple Correspondence Analysis (speMCA)
• Class Specific Analysis (csMCA)
• Multiple Factor Analysis (multiMCA)
• "standardized" Multiple Correspondence Analysis (stMCA)
• guides for interpretation (test-values, contributions, etc.)
• inductive tests
• analysis of structuring factors (concentration ellipses, interactions, etc.)
• graphical representations (with and without ggplot2)

Besides, it also provides :

• several functions for bivariate associations between variables (phi coefficients, Cramer's V, correlation coefficients, eta-squared, etc.),
• the translation of logit models coefficients into percentages,
• weighted contingency tables,
• an underrated association measure for contingency tables ("Percentages of Maximum Deviation from Independence", aka PEM).

Documentation

Please visit https://nicolas-robette.github.io/GDAtools/ for documentation

Installation

Execute the following code within R:

if (!require(devtools)){
    install.packages('devtools')
    library(devtools)
}
install_github("nicolas-robette/GDAtools")

References

Bry X., Robette N., Roueff O., 2016, « A dialogue of the deaf in the statistical theater? Adressing structural effects within a geometric data analysis framework », Quality & Quantity, 50(3), pp 1009–1020 [https://link.springer.com/article/10.1007/s11135-015-0187-z]

Le Roux B. and Rouanet H., 2010, Multiple Correspondence Analysis, SAGE, Series: Quantitative Applications in the Social Sciences, Volume 163, CA:Thousand Oaks.

Le Roux B. and Rouanet H., 2004, Geometric Data Analysis: From Correspondence Analysis to Stuctured Data Analysis, Kluwer Academic Publishers, Dordrecht.

Deauvieau J., 2010, « Comment traduire sous forme de probabilites les resultats d'une modelisation logit ? », Bulletin de Methodologie Sociologique, 105(1), 5-23.

Cibois P., 1993, « Le PEM, pourcentage de l'ecart maximum : un indice de liaison entre modalites d'un tableau de contingence », Bulletin de Methodologie Sociologique, 40, pp 43-63, [http://cibois.pagesperso-orange.fr/bms93.pdf]

Rakotomalala R., « Comprendre la taille d'effet (effect size) », [http://eric.univ-lyon2.fr/~ricco/cours/slides/effect_size.pdf]