For seasonal adjustment use either X11 or Tramo/Seats. Also, do not use the HP filter. See Pfeifer(2013): “A Guide to Specifying Observation Equations for the Estimation of DSGE Models”
For seasonal adjustment use either X11 or Tramo/Seats. Also, do not use the HP filter. See Pfeifer(2013): “A Guide to Specifying Observation Equations for the Estimation of DSGE Models”