The members at the bottom
are stacked up on the right-hand side. Clicking on the stack has the effect of moving
members from the stack into the visible area, and a stack now forms on the left-hand
side. In this way, the members are dealt from the right-hand stack, into the middle
area, and then onto the left-hand stack. This makes the decomp usable even if the
user drills down to levels with thousands of members.
Figure 6-44 also shows a Pareto chart at the bottom of the decomp. One of the
complaints some customers have about the decomp is that all the boxes are the
same size, and thus they do not indicate the relative size of the measure for one box
compared to another. The Pareto chart does this by the showing relative sizes in a
bar chart, with the values for the bars being shown on the left axis. Unless there are
many members, the Pareto chart shows a bar for all the members. Those that are
currently displayed on the screen are shown in a lighter color than those in the stack;
the bar colors match the colors of the boxes in the decomp.
There is also a thin line moving from the lower left to the upper right in the Pareto
chart. This line shows the growth from zero to 100%, with the values for the line
being on the right axis. This shows how quickly a level reaches a certain percentage.
For example, the line crosses the 50% threshold on the third bar, which means that
the first three cities in the Hessen province account for over 50% of the total for all
cities in Hessen.
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