The map of the prototype has been made using the attribute weight determination
technique described in Section 17.4. These weights were determined using the data
and product catalog described above. To be able to impute the missing values, we
excluded attributes having more than 50% missing values and categories of (multivalued)
categorical attributes that were observed less than 10 times. The weights
determined in this way are shown in Table 17.3. Note that attributes not mentioned in
the table have a weight of zero and, hence, have no influence in the MDS procedure.
According to our method, Brand andMemory Size are the most important attributes
determining popularity of MP3 players and receive the highest weights.