R: Number of Observations

nObs.maxLik {maxLik} | R Documentation

## Number of Observations

### Description

Returns the number of observations for statistical models, estimated by Maximum Likelihood using `maxLik`.

### Usage

    ## S3 method for class 'maxLik'
    nObs(x, ...)

### Arguments

`x` | a statistical model estimated by Maximum Likelihood using `maxLik`.
`...` | further arguments (currently ignored).

### Details

The `nObs` method for “maxLik” objects can return the number of observations only if log-likelihood function (or the gradient) returns values by individual observation.

### Value

numeric, number of observations

### Author(s)

Arne Henningsen, Ott Toomet

### See Also

`nObs`, `maxLik`, `nParam`.

### Examples

    ## fit a normal distribution by ML
    # generate a variable from normally distributed random numbers
    x <- rnorm( 100, 1, 2 )
    # log likelihood function (for individual observations)
    llf <- function( param ) {
       return( dnorm( x, mean = param[ 1 ], sd = param[ 2 ], log = TRUE ) )
    }
    ## ML method
    ml <- maxLik( llf, start = c( mu = 0, sigma = 1 ) )
    # return number of onservations
    nObs( ml )

[Package maxLik version 1.3-4 Index]