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My data is in quarterly and I am trying to see the value at level and 1st difference.
Normally the 1st difference is in DY=Y-Y(-1)
That's mean my result in 1st difference will be, for example forth quarter minus third quarter (in the same year different quarter).

How can I estimate year on year basic?
I want estimate the first difference like, 2015 Q4 minus 2014 Q4 (different year but same quater).

d(y,0,4)

Hi Gareth,

mean that I need to genr d(y,0,4) ?

Or just use it in place.

Sorry, I don't quite understand.

Let's say, I want to use it in Unit Root test? What should I select?
Attached the file below for your references.

show d(y,0,4)

..

If you like.

Then how can I check wether is stationary at first difference or not ?