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Diversity-oriented searches retrieve objects not only similar to a reference element but also related to the different types of collections within the queried dataset. While such characterization is flexible enough to include methods originally from information retrieval, data clustering, and similarity searching under the same umbrella, diversity metrics are expected to be much less paradigm-biased in order to discriminate which approaches are more suitable and when they should be applied. Accordingly, we extend and implement a broad set of quality metrics from those distinct realms and experimentally discuss their trends and limitations. In particular, we evaluate the suitability of data clustering indexes, and similarity-driven measures regarding their adherence to diversified similarity searching. Experiments in real-world datasets indicate such measures are capable of distinguishing diversity methods from different paradigms, but they heavily favor the approaches of the same group – especially cluster indexes. As an alternative, we argue diversity is better addressed by a set of measures rather than a single quality value. Therefore, we propose the Diversity Features Model (DFM) that combines the perspectives of the competing approaches into a multidimensional point whose features are calculated based on the distance distribution within both retrieved and queried datasets. Empirical evaluations showed DFM compares different diversity searching approaches by considering multiple criteria, whereas overall winners can be found by ranking aggregation or visualized through parallel coordinates maps.

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1	Camila Lopes(camila@ifnmg.edu.br)
2	Daniel Jasbick(danieljasbick@id.uff.br)
3	Marcos Bedo(marcosbedo@id.uff.br)
4	Lucio Santos(santos@ifnmg.edu.br)

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