Note: To apply forecasting, the
line chart must contain a date or datetime item.
On the
Properties tab for the line chart
visualization, you can adjust the number of data points to predict by using the
Duration option. You can also specify the degree of confidence for the
confidence band by using the
Confidence option.
On the
Roles tab, you can add measures to the
forecast as
Underlying factors. The
forecasting model evaluates the additional measures to determine whether they contribute to the accuracy
of the forecast. If the additional measures do not increase the accuracy of the forecast,
then they are not used. If the additional measures do increase the accuracy of the
forecast, then the forecast line is adjusted, and the confidence bands are narrowed.
Note: Underlying factors are available
only if your line chart contains a single measure in the Measures role.