fmobj {rmutil} | R Documentation |

## Object Finder

### Description

`fmobj`

inspects a formula and returns a list containing the
objects referred to, with indicators as to which are unknown parameters,
covariates, factor variables, and functions.

### Usage

fmobj(z, envir=parent.frame())

### Arguments

`z` |
A model formula beginning with ~, either in Wilkinson and
Rogers notation or containing unknown parameters. |

`envir` |
The environment in which the formula is to be
interpreted. |

### Value

A list, of class `fmobj`

, containing a character vector
(`objects`

) with the names of the objects used in a formula, and
logical vectors indicating which are unknown parameters
(`parameters`

), covariates (`covariates`

), factor variables
(`factors`

), and functions (`functions`

).

### Author(s)

J.K. Lindsey

### See Also

`finterp`

### Examples

x1 <- rpois(20,2)
x2 <- rnorm(20)
x3 <- gl(2,10)
#
# W&R formula
fmobj(~x1+x2+x3)
#
# formula with unknowns
fmobj(~b0+b1*x1+b2*x2)
#
# nonlinear formulae with unknowns
# log link
fmobj(~exp(b0+b1*x1+b2*x2))

[Package

*rmutil* version 1.0

Index]