[R-pkgs] Formula 1.0-0: Model formulas with multiple parts and responses

Achim Zeileis Achim.Zeileis at R-project.org
Tue Apr 6 16:12:59 CEST 2010

Dear useRs,

version 1.0-0 of the "Formula" package has just been released on CRAN


accompanied by an article in the Journal of Statistical Software


It provides simple infrastructre for processing formulas like

   y ~ x1 + x2 | z1 + z2

where there are two groups of explanatory variables, e.g., pertaining to 
separation equations for mean and variance or to regressors and 
instruments etc. Furthermore formulas with multiple repsonses are 
supported such as

   y1 + y2 ~ x

which has a bivariate reponse with potentially different classes, e.g., 
factors, numeric, Survival etc.

Best wishes,

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