enhancementhelp wanted
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描述
I don't think there are any packages in Julia that implement nice versions of the standard filters used in econ, like the HP filter. See, e.g., time series filters here:
http://statsmodels.sourceforge.net/stable/tsa.html#time-series-filters
This is another important filter, for seasonal adjustment:
https://www.census.gov/srd/www/x13as/x13down_unix.html
In Python and R there are wrappers:
https://github.com/christophsax/seasonal http://statsmodels.sourceforge.net/devel/_modules/statsmodels/tsa/x13.html
but not Julia, as far as I know.