A few descriptions for you:
The waterfall chart is very useful for showing components that contribute to a larger total, but that can be either positive or negative values. Examples would be contributions to profitability, etc. The waterfall chart includes an initial value, "n" number of constituent values (which are added/subtracted in a cumulative manner), and a calculated "final" value.
The stackedbar can be used in a similar way - you can think of it as a "vertical" pie chart. These are used to show individual contributions to a larger subtotal, but often when there are more than one "subtotal" to show.
The floating bar is used to show a "range" of values, such as the trading range of a stock price, or the statistical ranges of a value. You can see an example in a tag-based line chart by right clicking on the chart and selecting "Show Statistics".
- Rick
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