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我试图在Python的statsmodels中运行Dickey-Fuller测试但是从python 2.7和Pandas版本0.19.2得到错误P Running.数据集来自Github并导入相同

enter code here

 from statsmodels.tsa.stattools import adfuller
    def test_stationarity(timeseries):

    print 'Results of Dickey-Fuller Test:'
        dftest = ts.adfuller(timeseries, autolag='AIC' )
        dfoutput = pd.Series(dftest[0:4], index=['Test Statistic','p-value','#Lags Used','Number of Observations Used'])
        for key,value in dftest[4].items():
            dfoutput['Critical Value (%s)'%key] = value
        print dfoutput


    test_stationarity(tr)

给我以下错误:

Results of Dickey-Fuller Test:
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-15-10ab4b87e558> in <module>()
----> 1 test_stationarity(tr)

<ipython-input-14-d779e1ed35b3> in test_stationarity(timeseries)
     19     #Perform Dickey-Fuller test:
     20     print 'Results of Dickey-Fuller Test:'
---> 21     dftest = ts.adfuller(timeseries, autolag='AIC' …