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How to interprete an ACF plot of residuals time serie?

There is definitely still a seasonality pattern in your residuals. You could plot the periodogram of your residuals to identify the frequency(ies) and remove the seasonality component. In order to fit ...
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Why does autocorrelation function for trend in data decrease with increasing lag?

I had the same doubt as you since I was introduced to time series analysis by the same book. Although it is useful to have an autocorrelation coefficient defined in that way, it may be a good idea to ...
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Non-stationary time-series on visual analysis passes all Stationarity tests?

Your series does not pass all stationarity tests, it merely passes the ADF test. And even the ADF test is not a test of stationarity, it is a test of presence of a unit root. Your time series ...
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