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Hi Friends, I am looking for advice and recomendations about a data set that i'd like to analyze where I will measure association by frequencies of co-occurence. Let me explain in more detail. In my experiment participants were shown an object and asked to choose words that described the item from a list of 50 words. Responses were either 'yes' or no response was given. This procedure was repeated up to 3 times. I now want to group the word-associates by target item, I have a rough idea of what I want, but I'm open to suggestions from people who know more about this than I do. My plan is to find some method for finding the strength or description of association between items by examining counts of numbers of times items co-occured and produce a 'topographical map' where more frequently listed items are closer together--by analogy, something like an MDS model where we have a similarity matrix representing how often items are co-occuring (or is that the answer?) Anyway, looking forward to your input and suggestions, I think this is an interesting although maybe standard problem. Mike Healy