I have series and I need to determine if the series is stationary or non-stationary. According to this web page Link, is prefer to use the ADF and KPSS and then judge on the series. My result of ADF saying it is stationary and the result of KPSS saying it is non-stationary. So, I have the case 4 " KPSS indicates non-stationarity and ADF indicates stationarity - The series is difference stationary. Differencing is to be used to make series stationary. The differenced series is checked for stationarity." In fact, I could not understand that meaning, now is my series is stationary or non-stationary?
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This might be helpful https://stats.stackexchange.com/questions/372145/adf-test-showing-stationary-for-a-non-stationary-series – patagonicus Jul 09 '22 at 16:45
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I'm still confuse in case 4 :( – ayla Jul 09 '22 at 17:53