1st Difference

[joannetan92]

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).

[EViews Gareth]

d(y,0,4)

[joannetan92]

Hi Gareth,

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

[EViews Gareth]

Or just use it in place.

[joannetan92]

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.

[joannetan92]

Screen Shot 2017-05-06 at 12.42.06 AM.png (141.54 KiB) Viewed 13347 times

[EViews Gareth]

show d(y,0,4)

[joannetan92]

..

[EViews Gareth]

If you like.

[joannetan92]

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