Rev Language Reference

var - Variance

Calculate variance of a vector of real numbers

Usage

var(Real[] x)

Arguments

x : Real[] (pass by const reference)
A vector of values.

Return Type

RealPos

Details

This function accepts a vector of real numbers and returns the variance. This a measure of how the data points deviate from the mean which is calculated as follows: s^2 = (1 / (n - 1)) * \sum (x[i] - \bar{x})^2 which is essentially: (sum of squared differences from the mean) / (n - 1)

Example

# Define vector to calculate variance
x <- v(1, 2, 3, 4)
# or
x <- [1, 2, 3, 4]
# Calculate variance
var(x)

See Also

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