I have a time series with 1100 rows of data and am getting contradicting
results from these tests:1) My ACF and PACF plots have lot of lags and upon
looking visually, it looks as if the series in not-stationary.2) But when I
do the ADF test with with lag=30, I reject the null and conclude that series
is stationary.3) When I do the ADF with 100 lags, I end up accepting the
null and have to interpret that series is non stationary.Which one shall I
choose here ?  What is the correct way to go about in these situations.     



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