# 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

1 2 3 4 | ```
mvformula(x)
as.mvformula(x)
is.mvformula(x)
``` |

### Arguments

`x` |
an |

### 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

`mvabund`

.
`manylm`

.

### Examples

1 2 3 4 5 6 7 8 9 10 11 12 13 14 |