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A command that creates a Similarity from every selected Confusion.
The Average procedure averages:
similarityij= similarityji = (confusionij + confusionji) / 2 |
The Houtgast procedure as described in the paper by Klein, Plomp & Pols (1970), expresses similarity between stimuli i and j by the number of times that stimulus i and j have resulted in the same response, summated over all response categories.
We use the following formula to calculate the Houtgast dissimilarities:
similarityij = ∑k=1..numberOfColumns min (confusionik, confusionjk) |
which is equivalent to the formula in the Klein et al. paper:
similarityij = ∑k=1..numberOfColumns (confusionik + confusionjk – |confusionik – confusionjk|) |
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