# Is this a stationary time series?

I have a wait-time time series for 10 weekdays(2 weeks) with 10 minutes intervals. I'm having hard time to interpret this? Is this stationary? I also applied Philips-Perron Unit root test and I got the following values. Any help is appreciated.

Dickey-Fuller = -8.4726, Truncation lag parameter = 5, p-value = 0.01

• What is the null hypothesis of the dickey fuller test, and what are the critical values? – fredrikhs Nov 10 '13 at 14:20
• I use PP.test function of R. I believe the null hypothesis is being non-stationary, but I might be wrong. – fatih Nov 10 '13 at 14:38
• In the description of the function it says that it is a test for the null hypothesis that x has a unit root against a stationary alternative. How do you interpret the p-value then? – fredrikhs Nov 10 '13 at 14:54
• Then I assume, I should reject the null hypothesis, because the p-value is less than significant boundary (0.05). So the series is stationary. Correct? – fatih Nov 10 '13 at 15:01
• That is correct. – fredrikhs Nov 10 '13 at 15:03