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|)|
© djmw, April 7, 2004