model.matrix.polywog {polywog} | R Documentation |
Model matrix of a polywog model
Description
Constructs the design matrix used to fit a polywog
model,
similar to model.matrix.lm
.
Usage
## S3 method for class 'polywog'
model.matrix(object, type = c("raw", "expanded"), ...)
Arguments
object |
a fitted model of class |
type |
|
... |
other arguments to be passed to further methods (typically only used internally) |
Details
There are two types of model matrix a user might want to construct.
First, there is the matrix of the raw input terms that go into the
eventual polynomial expansion. Such a matrix can be obtained by using
type = "raw"
(the default). The other form of the model matrix is
the full polynomial expansion, where each column contains some power of
the raw inputs. This can be obtained by using type = "expanded"
.
Value
The design matrix of the specified model, consisting either of raw
terms or the full polynomial expansion depending on the type
argument.
Author(s)
Brenton Kenkel and Curtis S. Signorino