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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