Start learning 50% faster. Sign in now
The Dickey-Fuller test is a statistical test used to check for stationarity in time series data. Stationarity refers to a property of a time series where the mean, variance, and autocovariance are constant over time. Non-stationary data, on the other hand, often requires transformation (such as differencing) to become stationary before applying many time series forecasting models, like ARIMA. The Dickey-Fuller test specifically tests the null hypothesis that a unit root is present in the data, which implies non-stationarity. If the test rejects the null hypothesis, it indicates that the data is stationary. Why Other Options Are Incorrect: • A: The Dickey-Fuller test does not directly test for seasonality. Seasonality would be identified through decomposition or by analyzing seasonal patterns in the data. • B: Autocorrelation is typically tested using the autocorrelation function (ACF), not the Dickey-Fuller test. • D: The moving average is a technique used for smoothing or forecasting, not for testing stationarity. • E: While stationarity is important for forecasting, the Dickey-Fuller test does not directly forecast future values; it assesses whether the data needs to be differenced before forecasting.
‘M $ K’ means ‘M is the mother of K’.
‘M # K’ means ‘M is the father of K’.
‘M @ K’ means ‘M is the husband of K’....
If 'A # B' means A is the brother of B, 'A $ B' means A is the mother of B, 'A % B' means A is the spouse of B, then which of the following expressions...
If J & I @ H + G is true then, how is G related to J?
'R - S' means 'R is the brother of S'
'R # S' means 'R is the daughter of S'
'R * S' means 'R is the father of S'
'R $ S' means 'R ...
If F % G means F is the sister of G, F # G means F is the mother of G, F @ G means F is the son of G, F $ G means F is the daughter of G. In the given e...
'A@B' means 'A is the father of B'. 'A#B' means 'A is the sister of B'. 'A$B' means 'A is the brother of B'. 'A%B' means 'A is the wife of B'.
If...
If ‘E # F + D + A * B & C’ is true, then how is D related to C?
'A + B' means 'A is the sister of B'. 'A - B' means 'A is the brother of B'. 'A X B' means 'A is the father of B'. 'A ÷ B' means 'A is the wife of B'. ...
‘R&S’ means ‘R is husband of S’.
‘R%S’ means ‘R is wife of S’.
‘R@S’ means ‘R is father of S’.
‘R#...