Last Modified Date: 22 Jul 2016
ResolutionTo resolve this issue, modify the forecast model by specifying trend and seasonality.
- In your view, right-click the forecast line, and select Forecast > Forecast Options.
- In the Forecast Options dialog box, under Forecast Model, select Trend and season.
CauseWhen Tableau's forecast model is enabled but cannot identify a seasonal pattern, Tableau cannot forecast future values and therefore is unable to apply a trend line.
When trend and seasonality is not specified in the forecast model, the summary may show the following:
Seasonal pattern: None (Searched for a seasonal pattern recurring every 12 Months)
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