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

From: Achim Zeileis <Achim.Zeileis_at_r-project.org>
Date: Tue, 06 Apr 2010 16:12:59 +0200 (CEST)


Dear useRs,

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

   http://CRAN.R-project.org/package=Formula

accompanied by an article in the Journal of Statistical Software

   http://www.jstatsoft.org/v34/i01/

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,
Z



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