averageBetweenWithin

function averageBetweenWithin(ldIn, cl): MetricResult;

Defined in: metrics/separability.ts:302

Mean distance between classes divided by mean distance within them.

The simplest possible separation ratio.

• Needs: projection only. Labels required.
• Range: [0, ∞), higher is better. 1 means between- and within-class distances are alike, i.e. no separation.
• Cost: O(N²·D).

Parameters

Parameter	Type
ldIn	PointsInput
cl	Clusters

Returns

MetricResult

Example

import { clusters, averageBetweenWithin } from "@saehrimnir/sickle";

const cl = clusters(projection, labels);
averageBetweenWithin(projection, cl).value;  // 10.7873
// 1 means between- and within-class distances are alike, i.e. no separation.