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Bar charts

Bar charts are excellent for giving an immediate visual impact for

data comparison where time is not important, such as comparing the

popularity of a few products in a marketplace.

Pie charts

Pie charts are excellent when you need to compare proportions, for

example, comparisons of departmental spending: what the

department spent on different items or what different departments

spent. They work best with smaller numbers of values, about half a

dozen; more than this and the visual impact begins to fade.

This is one of the charts that can be made into a 3D chart. It can

then be tilted, given shadows, and generally turned into a work of

art. You can choose to explode the pie chart, but this is an all or

nothing option, giving you no control over the degree of separation

of the segments.

Area charts

An area chart is a version of a line or column graph. It may be useful

where you wish to emphasize volume of change. Area charts have a

greater visual impact than a line chart, but the data you use will

make a difference. You may need to use transparency values in an

area chart.

Line charts

A line chart is a time series with a progression. It is ideal for raw

data, and useful for charts with plentiful data that shows trends or

changes over time where you want to emphasize continuity. On line

charts, the x-axis is ideal to represent time series data. 3D lines

confuse the viewer, so just using a thicker line often works better.

Scatter or XY charts

Scatter charts are great for visualizing data that you have not had

time to analyze, and they may be the best for data when you have a

constant value with which to compare the data; for example weather

data, reactions under different acidity levels, conditions at altitude,

or any data which matches two series of numeric data. In contrast to

line charts, the x-axis are the left to right labels which usually

indicate a time series.

Bubble charts

A bubble chart is used to represent three variables: two identify the

position of the center of a bubble on a Cartesian graph, while the

third variable indicates the radius of the bubble.

Chapter 7 Including Spreadsheets, Charts, and Other Objects 175

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OpenOffice.org OpenOffice - 3.2 Guía de usuario Pagina 175