# Forecasting a seasonal series with R

I am working with the program "R". I used the command "seas (X-13)" to deseasonalize my quarterly series, then I did the forecast with it. Therefore my forecast is in deseasonalized terms.

Now, I was asked to compare my forecast with the IMF (International Monetary Fund) projections... Is my forecast comparable with it?, or what can I do to make it comparable?

• Assuming either an additive or a multiplicative model, once you've removed the seasonal component you're basically fitting the trend and forecasting it. So I guess that your forecast is comparable with IMF's one as long as your low-pass filter for the trend skims the way IMF does. – Lisa Ann May 23 '19 at 16:26