This function returns the number of model parameters. The default method returns the component x$param$nParam.
x$param$nParam
nParam(x, free=FALSE, ...) # S3 method for default nParam(x, ...) # S3 method for lm nParam(x, ...)
Number of parameters in the model
a statistical model
logical, whether to report only the free parameters or the total number of parameters (default)
other arguments for methods
Ott Toomet, otoomet@econ.au.dk
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.
nObs for number of observations
nObs
# 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
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