Number of Observations
Returns the number of observations for statistical models,
estimated by Maximum Likelihood using maxLik.
## S3 method for class 'maxLik' nObs(x, ...)
x |
a statistical model estimated by Maximum Likelihood
using |
... |
further arguments (currently ignored). |
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.
numeric, number of observations
Arne Henningsen, Ott Toomet
## 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 )Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.