Seasonal Augmented Dickey-Fuller Unit Root Test

andreas_zaras — Tue, 29 Nov 2011 00:12:47 GMT

Hello,

I have a question about the seasonal unit root test incorporated in proc arima that is named in SAS output as "seasonal augmented dickey fuller unit root test".

I will pose my question by providing an example.

I run the following proc arima procedure:

proc arima data=aaa;

identify var=y stationarity=(adf=(n) dlag=m); */ m, n are integers (e.g. n=4 and m=12);

run

quit;

In the ouput i get a table entitled "seasonal augmented dickey fuller unit root test".

The p-values that i get in the column Pr<Tau are produced by comparing the column tau values of the reported table with the critical values tabulated by Hasza and Fuller (1982) or with the critical values tabulated by Dickey, Hasza and Fuller (1984)?

Alternatively the null hypothesis is that first difference and seasonal difference (s=m) [Hasza and Fuller (1982)] is needed to make the series y stationary or the null hypothesis is that only seasonal difference (s=m) [Dickey, Hasza and Fuller (1984)] is needed to make the series y stationary?

Thanks in advance,

Andreas

Seasonal Augmented Dickey-Fuller Unit Root Test

udo_sas — Tue, 29 Nov 2011 14:59:52 GMT

Hi Andreas -

You will find details about the augmented dickey fuller unit root test here: http://support.sas.com/documentation/cdl/en/etsug/63939/HTML/default/viewer.htm#etsug_macros_sect007.htm.

Thanks,

Udo

Re: Seasonal Augmented Dickey-Fuller Unit Root Test

andreas_zaras — Sat, 12 Jan 2013 20:34:50 GMT

Hello,

Thank you very much and sorry for the so late reply!

I thought i had replied earlier.

ANdreas

topic Seasonal Augmented Dickey-Fuller Unit Root Test in SAS Forecasting and Econometrics

Seasonal Augmented Dickey-Fuller Unit Root Test

Seasonal Augmented Dickey-Fuller Unit Root Test

Re: Seasonal Augmented Dickey-Fuller Unit Root Test