what options to I have for displaying (and using the results) from the Display Trend Line (and can I generate when I have the data in table form)?
While there isn't much you can do in the way of using Tableau's trends, you may be able to use one of the following workarounds:
Write formulas for desired statistics in calculated fields to generate values, as described in the Statistics Calculations Advanced On-Demand training video.
Use R-Integration to model data, return statistics to Tableau.
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