R: Coefficients of objects created by 'selm'

coef.selm {sn} | R Documentation

## Coefficients of objects created by `selm`

### Description

`coef` method for classes `"selm"` and `"mselm"`.

### Usage

    ## S4 method for signature 'selm'
    coef(object, param.type = "CP", ...)
    ## S4 method for signature 'mselm'
    coef(object, param.type = "CP", vector=TRUE, ...)

### Arguments

`object` | an object of class `"selm"` or `"mselm"` as created by a call to function `selm`.
`param.type` | a character string which indicates the required type of parameter type; possible values are `"CP"` (default), `"DP"`, `"pseudo-CP"` and their equivalent lower-case expressions.
`vector` | a logical value (default is `TRUE`) which selects a vector or a list format of the retuned value
`...` | not used, included for compatibility with the generic method

### Value

a numeric vector or a list (the latter only for `mselm-class` objects if `vector=FALSE`)

### Note

The possible options of `param.type` are described in the documentation of `dp2cp`; their corresponding outcomes differ by an additive constant only. With the `"CP"` option (that is, the ‘centred parametrization’), the residuals are centred around 0, at least approximately; this is a reason for setting `"CP"` as the default option. For more information, see the ‘Note’ in the documentation of `summary.selm`.

### Author(s)

Adelchi Azzalini

### References

Azzalini, A. with the collaboration of Capitanio, A. (2014). The Skew-Normal and Related Families. Cambridge University Press, IMS Monographs series.

### See Also

`dp2cp`, `summary.selm`, `selm` function, `selm-class`

### Examples

    data(wines, package="sn")
    m5 <- selm(acidity ~ phenols + wine, family="SN", data=wines)
    coef(m5)
    coef(m5, "dp")
    #
    m12 <- selm(cbind(acidity, alcohol) ~ phenols + wine,  family="SN", data=wines)
    coef(m12)
    coef(m12, "DP", vector=FALSE)

[Package sn version 1.5-0 Index]