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Trend lines
When you have a scattered grouping of points in a graph, you may
want to show the relationship of the points. A trend line is what you
need. Calc has a good selection of regression types you can use for
trend lines: linear, logarithm, exponential, and power. Choose the type
that comes closest to passing through all of the points.
To insert trend lines for all data series, double-click the chart to enter
edit mode. Choose Insert > Trend Lines, then select the type of trend
line from None, Linear, Logarithmic, Exponential, or Power. You can
also choose whether to show the equation for the trend line and the
coefficient of determination (R
2
).
To insert a trend line for a single data series, first select the data series
in the chart, and then right-click and choose Insert > Trend Line
from the context menu. The dialog for a single trend line is similar to
the one below but has a second tab (Line), where you can choose
attributes (style, color, width, and transparency) of the line.
To delete a single trend line or mean value line, click the line, then
press the Del key.
To delete all trend lines, choose Insert > Trend Lines, then select
None.
A trend line is shown in the legend automatically.
Figure 61: Trend Lines dialog
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