Given a set of cartesian coordinates, this function approximates the sphericity of the set by calculating the bivariate 95 ellipse of the set.

sphericity(x, y)

## Arguments

x A vector of x coordinates. A vector of y coordinates.

## Value

A single numeric value corresponding to the ratio between the minor and major axis of the bivariate 95 close to 1 indicates that the set is approximately circular; a value close to 0 indicates that the set is strongly elongated.

## Examples

# TODO