CODEWITHSUNDEEP
cluster-analysisk-meanselki
monkey
monkey

Reputation: 1

ELKI showing negative values in Pair Counting Measures

When i run some cepstral coefficient data generated from .wav files in ELKI wit Kmeans Algorithm k =32 and max iter=100 it gives negative values for the following Pair Counting Measures. Jaccard=-3.3627 Recall=-3.3627 Rand=-3.3627 and F1 Measure=2.8465 I searched somewhere for the range of these measures and they were (0,1). I ran this data with several other algorithms and having the same problem. Can anyone please interpret it?

Upvotes: 0

Views: 87

Answers (1)

Erich Schubert
Erich Schubert

Reputation: 8715

The values should be in the range of [0;1], but:

  • only if you have complete labels (missing labels can be skipped, but I'm not sure if our implementation handles this case yet)
  • the clustering must be a complete, non-overlapping, crisp partitioning

Furthermore, when clusters degenerate (depending on your data and seeding, this may happen with k-means) there could be empty clusters, and these again may yield undesired results with the literate implementation of these measures.

How did you label your data?

We try our best to also handle corner cases right; but we can only diagnose and fix what we have observed and can reproduce.

Upvotes: 1

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