Q_NX: The $Q_{NX}(K)$ criterion

Description

A curve indicating the percentage of points that are mild in- and extrusions or keep their rank.

Usage

Q_NX(Q)

Value

A vector with the values for Q_NX(K)

Arguments

Q: a co-ranking matrix

Author

Guido Kraemer

Details

$$ Q_{NX}(K) = \frac{1}{KN} \sum_{k=1}^{K}\sum_{l=1}^{K}Q_{kl} $$

References

Lueks, W., Mokbel, B., Biehl, M., & Hammer, B. (2011). How to Evaluate Dimensionality Reduction? - Improving the Co-ranking Matrix. ArXiv:1110.3917 [Cs]. http://arxiv.org/abs/1110.3917