Formula
swMATH ID:  23410 
Software Authors:  Achim Zeileis, Yves Croissant 
Description:  R package Formula: Extended Model Formulas. Infrastructure for extended formulas with multiple parts on the righthand side and/or multiple responses on the lefthand side (see <doi:10.18637/jss.v034.i01>). Extended Model Formulas in R: Multiple Parts and Multiple Responses. Model formulas are the standard approach for specifying the variables in statistical models in the S language. Although being eminently useful in an extremely wide class of applications, they have certain limitations including being confined to single responses and not providing convenient support for processing formulas with multiple parts. The latter is relevant for models with two or more sets of variables, e.g., different equations for different model parameters (such as mean and dispersion), regressors and instruments in instrumental variable regressions, twopart models such as hurdle models, or alternativespecific and individualspecific variables in choice models among many others. The R package Formula addresses these two problems by providing a new class “Formula” (inheriting from “formula”) that accepts an additional formula operator  separating multiple parts and by allowing all formula operators (including the new ) on the lefthand side to support multiple responses. 
Homepage:  https://cran.rproject.org/web/packages/Formula/index.html 
Source Code:  https://github.com/cran/Formula 
Dependencies:  R 
Related Software:  R; GAMLSS; ggplot2; betareg; Rcpp; JAGS; CODA; metafor; WinBUGS; BayesX; Stan; VGAM; bamlss; Stata; Mlogit; SAS; pscl; strucchange; geoR; BH 
Cited in:  3 Publications 
Standard Articles
1 Publication describing the Software  Year 


all
top 5
Cited by 7 Authors
1  Klein, Nadja 
1  Paula, Gilberto A. 
1  Umlauf, Nikolaus 
1  Vanegas, Luis Hernando 
1  Yi, Grace Yun 
1  Zeileis, Achim 
1  Zhang, Qihuang 
Cited in 2 Serials
2  Journal of Statistical Computation and Simulation 
1  Journal of Computational and Graphical Statistics 
Cited in 1 Field
3  Statistics (62XX) 