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17.6 E-Commerce ApplicationsIn this section, we describe three working prototypes that are available online. Twoof them implement the product catalog maps based on MDS and NL-PCA and thethird prototype is a graphical shopping interface (GSI). Both the MDS based productcatalog map and the GSI also have an option to use weights determined by themethod described in Section 17.4. All prototypes are using a product catalog ofMP3 players that is described next.The product catalog of MP3 players was made available to us by Compare Group.Compare Group hosts, among other European price comparison sites, the Dutch price comparison site http://www.vergelijk.nl. The product catalog usedis based on a database dump of this site from October 2007. At that moment, therewere 225 MP3 players listed on the site. In total, these products were described using45 attributes of which there were 16 numerical, 20 categorical, and 45 multi-valuedcategorical. Of these 45 attributes, 26 attributes were missing for more than half ofthe MP3 players. The other attributes are listed in Table 17.2. Note that although italso concerns MP3 players, it is different from that used in [21, 23, 24]. To be ableto determine the weights automatically as described in Section 17.4, we matchedthe product catalog to a clickstream log of the same website logged during a periodof two months from July 15 until September 15, 2007.Table 17.2: Attribute characteristics of the MP3 player data. Only the attributes havingless than 50% missing values are listed. For (multi-valued) categorical attributesonly the three most occurring values are shown.
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