Issue with the trendline offset from the data
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Description
For certain datasets, I observed that the trendline is offset from the data. Typically it is lower than the data.
Here is an example
In this example the data does not show any seasonal pattern, which make it not very suitable for prophet forecasting. However I would expect the trendline to be near the mean of the dataset.
Could anyone help me understand the underlying cause of this trendline offset?
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