Databases Reference
In-Depth Information
Figure 9-12.
Bar graph depicting negative and positive variances of salary over the years
Another form of a bar graph is called the “progressive bar chart,” or “waterfall chart.”
A waterfall chart shows how the initial value of a variable increases or decreases during a series
of operations or transactions. The first bar begins at the initial value, and each subsequent bar
begins where the previous bar ends. The length and direction of a bar indicates the impact
(positive or negative, for example) of the operation or transaction. The resulting graph is a
waterfall that shows how the transactions or operations lead to the final value of the variable.
Figure
9-13
shows the impact of several contributing factors to the cash flow and
final balance of an IT company.
Figure 9-13.
Waterfall graph depicting the cash flow of a company
