Statistics

The basic statistics extension that is located in tango.math.Stats.*

equals(x: number, y: number): boolean

Return true iif Math.abs(x - y) < 1e-29.

equals(x: Array, y: Array): boolean

Return true iif the lengths of array x and y are same and each items in same index are equals().

max(arr): number

Gets the max value of an array.

min(arr): number

Gets the min value of an array.

sum(arr): number

Gets the sum of an array.

normalize(arr): []

Normalizes the array, for instance: normalize([1, 7, 3]) $=[\frac{1}{1+7+3}, \frac{7}{1+7+3}, \frac{3}{1+7+3}]$.

mean(arr): number

Gets the average of an array.

var(arr): number

Gets sample variance of an array.

stddev(arr): number

Gets the standard deviation of an array.

linearLeastSquare(X, Y, fn = (x=>x)): [number, number]

Gets the [a, b], where $\text{fn}(\vec{Y}) = a \cdot \text{fn}(\vec{X}) + b$.

Passing Math.log to get linear least square for $\vec{Y} = c \cdot (\vec{X})^a$, where $c = e^b$.