Return number of observations for statistical models

Returns number of observations for statistical models. The default method assumes presence of a component param$nObs in x.

Usage

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

Arguments

x

a statistical model, such as created by lm

...

further arguments for methods

Details

This is a generic function. The default method returns the component x$param$nObs. The lm-method is based on qr-decomposition, in the same way as the does summary.lm.

Value

numeric, number of observations

Author

Ott Toomet, otoomet@econ.au.dk

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
nObs(m)
#> [1] 100