Resolution:
## Figure 1.
Aggregation scheme. Multivariate data is represented as a table of N rows and M columns, where each column can be of a different scale type. Rows and columns can
be aggregated independently, resulting in hierarchies as indicated by the attached
dendrograms. Aggregation of rows is applied column-wise, according to the respective
scale type, while the aggregation of columns is only supported for compatible scale
types. For example, the set of leaf nodes of v is a collection of rows Rand the set of leaf nodes of _{v }w is a collection of columns. Aggregating v results in a new row with values determined using rows R_{1}, R_{2}, and R_{3 }(red square). Similarly, aggregating w results in a new column Cwith values determined from columns _{w }C_{2 }and C_{3 }(green square). As a result of collapsing both v and w, the overlap of the red and green squares will be represented by only one cell.
Heinrich |