Databases Reference
In-Depth Information
Block Chart
A
Block Chart
can be used to display hierarchical information, by displaying blocks
within blocks. In our example, the size of the block corresponds to the number of
passengers that were transported. Each block represents a destination city, and they
are all grouped into bigger blocks according to their corresponding countries.
In this example we can clearly see that the majority of passengers have arrived
somewhere in the
United States
. Within the US, we can see that
Atlanta, GA
and
Chicago, IL
are the most popular destinations.
By comparing blocks within the chart, we can see that the combined total number of
people traveling from US to
Canada
,
Mexico
, and the
United Kingdom
is smaller
than the number of people traveling to
Atlanta, GA
.
Trellis Chart
The
Trellis Chart
is not really a separate chart, but a chart option that exists on all
charts; with the exception of the straight tables and pivot tables. It creates a grid in
which a separate chart is created for each distinct value of the first dimension. To
facilitate easy comparisons between charts, each chart's axis uses the same scale.
