This small package can be used to compute the mean or variance of
values in one pass. Values are added with the Add method.
The Mean method returns the mean of the values. If no values
have been adde Mean returns 0. The method Variance returns
the variance of the added values. If there are less then two
values in the accumulator, Variance returns 0.
The Del method can be used to remove an added value. It panics
if no values have been added or all values have been removed.
This method can be used to compute the mean and variance over
a sliding window. Values are added on one side, and removed on
the other.
import "github.com/chmike/variance"
...
var acc variance.Accumulator
acc.Add(0)
acc.Add(1)
acc.Add(2)
fmt.Println(acc.Mean()) // outputs 1.
fmt.Println(acc.Variance()) // outputs 1.
acc.Del(0)
fmt.Println(acc.Mean()) // outputs 1.5
fmt.Println(acc.Variance()) // outputs 0.5