EViews.com

Where L1 is the sum of the absolute values, and L2 is the square root of the sum of the squares.

It is not currently supported by EViews.

Have you tried saving it to somewhere other than onedrive?

Yes, but they wrote the EViews bit too :)

I'm not sure I understand what you're asking, sorry. Are you asking how to do the seasonal forecast, or how EViews does it? If the latter, the Help section has details here: https://eviews.com/help/helpintro.html#page/content%2Fseries-Seasonal_Adjustment.html%23ww161272 (scroll down to the paragraph...

EViews doesn't support forecasting from its STL routine as a built in feature.

It sounds like you're pasting in the wrong place.

What does "rewrite in monthly" mean?

Perhaps you could include some screenshots of what you're doing?

Don't put it in braces.

If you have something like: %fcast_series = "X" xput {%fcast_series} xon fcst_series<-ts({%fcst_series}) xoff that will be passed into R as: fcast_series<-ts("x") which will cause the error because R is not expecting the quotes. So you'd need to use R to remove the quotes. Perhap...

Presumably you've already used XPUT to transfer the data across, and the issue is referencing that variable in R?

Ah, you want separate lags for different regressors. Yeah, no :(

Use fixed lags.

It would choose the best ARIMA orders for the given seasonal difference of one.