# Should we create a [kpss-test] tag?

We have tag with 148 questions.

There are 407 questions I find when searching for ADF (Augmented Dickey Fuller).

There are 174 questions I find when searching for KPSS (Kwiatkowski-Phillips-Schmidt-Shin).

Both the ADF Test as well as the KPSS test are tests which test whether a time series is stationary. The Null hypothesis of the ADF test is that there is a Unit root. The Null hypothesis of the KPSS Tests is that the time series is stationary.

As KPSS test more or less the complement to the ADF test I propose to create a tag for the KPSS test as well.

More generally we could discuss the same issue for other tests, e.g. the Phillips-Perron Test.

• Seems reasonable to me; without knowing I would expect that kpss already existed. I think it will be helpful. – usεr11852 Oct 2 '17 at 21:00
• Looks like you can go ahead and create this tag, if you want to. – amoeba Oct 9 '17 at 10:48
• @amoeba Okay I just created it – Ferdi Oct 10 '17 at 10:00
• Please see stats.meta.stackexchange.com/questions/4285. – amoeba Oct 10 '17 at 10:38
• Don't forget to post and accept an answer in this thread stating that the tag was created! – amoeba Oct 12 '17 at 21:56
• @amoeba thank you for teaching me how this all works – Ferdi Oct 12 '17 at 22:09
• Well, thank you for doing the job! – amoeba Oct 13 '17 at 7:26