terms.formula
Construct a terms Object from a Formula
This function takes a formula and some optional arguments and
constructs a terms object. The terms object can then be used to
construct a model.matrix
.
 Keywords
 models
Usage
"terms"(x, specials = NULL, abb = NULL, data = NULL, neg.out = TRUE, keep.order = FALSE, simplify = FALSE, ..., allowDotAsName = FALSE)
Arguments
 x
 a formula.
 specials
 which functions in the formula should be marked as
special in the
terms
object? A character vector orNULL
.  abb
 Not implemented in R.
 data
 a data frame from which the meaning of the special symbol
.
can be inferred. It is unused if there is no.
in the formula.  neg.out
 Not implemented in R.
 keep.order
 a logical value indicating whether the terms should
keep their positions. If
FALSE
the terms are reordered so that main effects come first, followed by the interactions, all secondorder, all thirdorder and so on. Effects of a given order are kept in the order specified.  simplify
 should the formula be expanded and simplified, the pre1.7.0 behaviour?
 ...
 further arguments passed to or from other methods.
 allowDotAsName
 normally
.
in a formula refers to the remaining variables contained indata
. Exceptionally,.
can be treated as a name for nonstandard uses of formulae.
Details
Not all of the options work in the same way that they do in S and not all are implemented.
Value

A
terms.object
object is returned. The object itself is
the reordered (unless keep.order = TRUE
) formula. In all
cases variables within an interaction term in the formula are
reordered by the ordering of the "variables"
attribute, which
is the order in which the variables occur in the formula.
See Also
Community examples
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