Seasonal Adjustment Quarterly Data

Estimation ML/Bayesian estimation
1

Hello everyone,

I have a quick question regarding seasonal adjustment in Dynare. I read the manual but am not really sure whether I am doing it correctly as there are too many options.

I have, for instance, quarterly GDP or Investment data that is not seasonally adjusted yet, which I wish to perform. From the manual’s example I take the following code and just adjust the data input:

ts = dseries(y,'1949M1');
o = x13(ts);
o.transform('function','auto','savelog','atr');
o.automdl('savelog','all');
o.x11('save','(d11 d10)');
o.run();
o.clean();

y_SA=o.results.d11;

Now, my question is if I have to take something specific into account because I am working with quarterly and not monthly data or does the algorithm look for a pattern to adjust no matter what frequency it is in?

Thank you so much in advance!

2

Usually, the software will adjust automatically to the frequency specified, which is monthly given your dseries command

3

Ok, thank you. This code is from the manual. I define my dseries as quarterly. So this means that I can leave the rest of the code as is?

Thank you so much for your quick reply, as usual :slight_smile:

4

Yes. But with any type of seasonal adjustment it’s always recommended to inspect the output.