Start learning 50% faster. Sign in now
The Dickey-Fuller test is used to assess whether a given time series is stationary or exhibits a unit root. Stationarity means that the statistical properties of the data, such as mean, variance, and autocorrelation, are constant over time. If a time series is not stationary, it often contains trends or seasonality that can lead to inaccurate forecasting. The Dickey-Fuller test tests the null hypothesis that a time series has a unit root (i.e., it is non-stationary) against the alternative hypothesis that the series is stationary. This is critical because most time series forecasting models, such as ARIMA, require stationary data to produce accurate predictions. Why other options are wrong: a) The presence of seasonality : While stationarity tests can sometimes help identify seasonality, the Dickey-Fuller test does not directly test for seasonality. b) The relationship between lagged values : The Dickey-Fuller test does not test for lagged relationships; instead, it focuses on whether the series itself is stationary. c) Whether the data exhibits a random walk : The Dickey-Fuller test indirectly tests for a random walk by assessing if the data is stationary or not. d) The degree of trend in the data : While trends affect stationarity, the Dickey-Fuller test is not focused on quantifying the degree of the trend.
Given below are five scattered segments of a sentence. Indicate the correct sequence which correctly assembles the segments and completes the sentence....
Artificial intelligence is (A) common the customer experience by providing personalized (B) recommendations and support. Chatbots, ...
Which of the following is the fifth sentence after rearrangement of the given paragraph?
In the question given below, rearrange the parts of the sentence in the correct order, and choose the correct option. If all the parts are arranged in t...
A) Jamaica is one of the most beautiful islands in the world.
B) Visitors can see, eat or drink Jamaica’s exports such as sugar, citrus fru...
Directions: In each of the following questions, a sentence is given with three words marked as (A), (B), and (C). These words may or may not be placed...
Which of the following is the second sentence of the passage?
Each question is divided into four parts a,b,c,d. In some questions they are not in the sequence so according to grammar and context re- arrangement is...
In each sentence below four words have been printed in bold which are numbered (1), (2), (3) and (4) One of these words may be misspelt or inappropriat...