mvformula {mvabund} | R Documentation |
Model Formulae for Multivariate Abundance Data
Description
mvformula
is a method to create an object of class mvformula
as.mvformula
is a function to turn a formula into a mvformula
is.mvformula
tests if its argument is a mvformula
object.
mvformula
is a class of objects for which special-purpose plotting and regression functions have been written in the mvabund-package
. The above are useful preliminary functions before analysing data using the special-purpose functions. These new functions were written specially for the analysis of multivariate abundance data in ecology, hence the title 'mvabund'.
Usage
mvformula(x)
as.mvformula(x)
is.mvformula(x)
Arguments
x |
an R object. |
Details
mvformula
is a method to create an object of class mvformula
If the response of the resulting formula is not a mvabund
object, a warning
will be printed.
as.mvformula
is a function to turn a formula into a mvformula
if the response in x is a data.frame or an unsuitable object the conversion
will fail.
Value
a formula mvabund for mvformula
and as.mvformula
a logical value indicating whether x
is a mvformula
object
Author(s)
Ulrike Naumann and David Warton <David.Warton@unsw.edu.au>.
See Also
Examples
require(graphics)
data(spider)
spiddat <- mvabund(spider$abund)
X=as.matrix(spider$x)
## Create a formula for multivariate abundance data:
foo <- mvformula( spiddat~X )
## Check whether foo is a mvformula:
is.mvformula(foo)
## Plot a mvformula:
plot(foo)