I am relatively new with using SPSS and would appreciate your help.
Having said that, I would like to ask if anyone knows how to enter the data from a card sorting study in SPSS (v13) and analyze them with clustering algorithms (produce dendrograms etc).
Briefly stated, in a card sorting participants are given cards showing some content with no pre-established groupings. They are asked to sort cards into groups that they feel are appropriate and then describe each group.
From the groupings of the participants a similarity matrix is contructed, showing how often each pair of cards have been placed together by all participants. For example for 3 cards and 5 participants that could be something like:
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Card1 Card2 Card3 Card1 0 4 5 Card2 4 0 2 Card3 5 2 0
Can you please tell me how i should enter the data in SPSS to use Classify later on?
Which is the variable and which is the case?
Do I simply enter the frequencies matrix as is?
What i want to do
1) cluster the cards and create a dendrogram
2) define the "optinal" number of clusters based on the Elbow Criterion - (see Wikipedia - Cluster Analysis since I am not allowed by the forum to post the link yet ). I assume i need to use factor analysis and the scree plot?? since i cant see any related option under the classify of the SPSS...)
Thanks in advance to anyone who invests his time on this!