terms.formula | R Documentation |
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
.
## S3 method for class 'formula' terms(x, specials = NULL, abb = NULL, data = NULL, neg.out = TRUE, keep.order = FALSE, simplify = FALSE, ..., allowDotAsName = FALSE)
x |
a formula. |
specials |
which functions in the formula should be marked as
special in the |
abb |
Not implemented in R. |
data |
a data frame from which the meaning of the special symbol
|
neg.out |
Not implemented in R. |
keep.order |
a logical value indicating whether the terms should
keep their positions. If |
simplify |
should the formula be expanded and simplified, the pre-1.7.0 behaviour? |
... |
further arguments passed to or from other methods. |
allowDotAsName |
normally |
Not all of the options work in the same way that they do in S and not all are implemented.
A terms.object
object is returned. The object itself is
the re-ordered (unless keep.order = TRUE
) formula. In all
cases variables within an interaction term in the formula are
re-ordered by the ordering of the "variables"
attribute, which
is the order in which the variables occur in the formula.
terms
, terms.object
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