R: Number of model parameters

nParam {miscTools} | R Documentation

## Number of model parameters

### Description

This function returns the number of model parameters. The default method returns the component `x$param$nParam`.

### Usage

    nParam(x, free=FALSE, ...)
    ## Default S3 method:
    nParam(x, ...)
    ## S3 method for class 'lm'
    nParam(x, ...)

### Arguments

`x` | a statistical model
`free` | logical, whether to report only the free parameters or the total number of parameters (default)
`...` | other arguments for methods

### Details

Free parameters are the parameters with no equality restrictions. Some parameters may be restricted (e.g. sum of two probabilities may be restricted to equal unity). In this case the total number of parameters may depend on the normalisation.

### Value

Number of parameters in the model

### Author(s)

Ott Toomet, otoomet@econ.au.dk

### See Also

`nObs` for number of observations

### Examples

    # Construct a simple OLS regression:
    x1 <- runif(100)
    x2 <- runif(100)
    y <- 3 + 4*x1 + 5*x2 + rnorm(100)
    m <- lm(y~x1+x2)  # estimate it
    summary(m)
    nParam(m) # you get 3

[Package miscTools version 0.6-22 Index]