I am attempting to work with Prophet using monthly data (i.e. one date point per month) and I am a bit confused on the appropriate handling of the 'periods' argument as the PDF documentation specifies it should represent the number of days.
However, many other forums seem to point to it being the number of data points.
If I want to add yearly seasonality how should I approach this argument? Do I input 12 or 365.25?
If I want to add monthly seasonality what would I enter?
The function seems to give me a better fitted line when I use 365.25, but I am not sure if that is just a coincidence.