Apple Pages Guide de l'utilisateur télécharger pdf (Page 236)

Custom: Lets you set error bars based on your own criteria. In the Positive eld, specify

how far above the data points you want the error bars to extend; in the Negative eld,

specify how far below the data points you want the error bars to extend.

Showing Trendlines in Charts

Trendlines are lines calculated and drawn to t your data, according to the type of

equation you prefer. You can display trendlines for most 2D chart types, except stacked

bar, column, and area charts and pie charts.

To show a trendline for the data points in a selected series:

1 Select the series for which you want to show a trendline, and then click the Inspector

button in the toolbar.

2 Click the Chart button in the Inspector window, and then click Series.

3 Click Advanced at the bottom of the Series pane. Then click Trendline.

4 Select, from among the following, the type of equation you want to use to calculate

the trendline:

Linear: Produces a best-t straight line, most useful for simple, linear data series.

Logarithmic: Produces a best-t curved line, most useful when values increase or

decrease quickly, then level out.

Polynomial: Produces a curved line that has hills and valleys to show where values

rise or fall. Specify the order of polynomial you want to use in the Order eld; order 4

produces as many as 3 hills or valleys.

Power: Produces a curved line for use when you want to compare measurements

that increase at a specic rate. Power can’t be used with data that contains zero or

negative values.

Exponential: Produces a curved line for use when values rise or fall at increasingly

higher rates. Exponential can’t be used with data that contains zero or negative values.

Moving Average: Produces a trendline using the number of data points you specify in

the Period eld, averages them, and uses the average value as a trendline point.

5 To see the equation that describes a trendline, select the line, and then select Show

Equation. You can drag this equation to wherever you want it to appear on the page.

6 To see the R-squared value that was used to calculate a trendline, select the line, and

then select Show R^2 Value. You can drag this number to wherever you want it to

appear on the page.

7 To display a label for a trendline, select it, and then select Label. Type a label in the

adjacent eld.

8 To change the line color or thickness, select it, and then click the Graphic button

in the Inspector window. Make adjustments using the Stroke controls of the

Graphic inspector.

236 Chapter 10 Creating Charts from Data

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Apple Pages Guide de l'utilisateur Page 236