what is dickey-filler for 2d signals? what is the test signal for 2d signal what is dickey fuller adf how to measure stationarity of 2d signal what is 2d dickey-fuller what is dickey fuller what is dickey fulller in a signal can you test stationarity with 2d signal what is dickey fulller test what is the signal that is 2d? what is a signal test what type of signal test for 2d what is a 2d signal? what is dickley fuller what is dickey fulller in radio what is 2d signal when to rely on dickey-fuller in stationarity testing what is the test for stationarity what is dickey-fuller for what is the test on 2d signals