# coef

##### Extract Model Coefficients

`coef`

is a generic function which extracts model coefficients
from objects returned by modeling functions. `coefficients`

is
an *alias* for it.

- Keywords
- models, regression

##### Usage

```
coef(object, …)
coefficients(object, …)
```

##### Arguments

- object
an object for which the extraction of model coefficients is meaningful.

- …
other arguments.

##### Details

All object classes which are returned by model fitting functions
should provide a `coef`

method or use the default one.
(Note that the method is for `coef`

and not `coefficients`

.)

Class `"aov"`

has a `coef`

method that does not report
aliased coefficients (see `alias`

).

##### Value

Coefficients extracted from the model object `object`

.

For standard model fitting classes this will be a named numeric vector.
For `"maov"`

objects (produced by `aov`

) it will be a matrix.

##### References

Chambers, J. M. and Hastie, T. J. (1992)
*Statistical Models in S*.
Wadsworth & Brooks/Cole.

##### See Also

`fitted.values`

and `residuals`

for related methods;
`glm`

, `lm`

for model fitting.

##### Examples

`library(stats)`

```
x <- 1:5; coef(lm(c(1:3, 7, 6) ~ x))
```

*Documentation reproduced from package stats, version 3.4.1, License: Part of R 3.4.1*