var_n: Sample Variance for Numeric Values
In dvmisc: Faster Computation of Common Statistics and Miscellaneous Functions

Description Usage Arguments Value Examples

Written in C++, this function should always run faster than var for numeric vectors. For integer vectors, var_i should run even faster.

var_n(x)

`x`	Numeric vector.

Numeric value.

# In general, var_n is much faster than var.
x <- rnorm(1000)
all.equal(var(x), var_n(x))
benchmark(var(x), var_n(x), replications = 1000)

# For integer vectors, var_i should be even faster.
x <- rpois(1000, lambda = 5)
all.equal(var(x), var_i(x))
benchmark(var(x), var_n(x), var_i(x), replications = 1000)