Which of the following conditions must hold for the autoregressive part of an ARMA model to be stationary?
A. All roots of the characteristic equation must lie outside the unit circle
B. All roots of the characteristic equation must lie inside the unit circle
C. All roots must be smaller than unity
D. At least one of the roots must be bigger than one in absolute value
Giải bởi Vietjack
Chọn đáp án: A
Which of the following would probably NOT be a potential “cure” for non-normal residuals?
If a Johansen “max” test for a null hypothesis of 1 cointegrating vectors is applied to a system containing 4 variables is conducted, which eigenvalues would be used in the test?
What would be the consequences for the OLS estimator if autocorrelation is present in a regression model but ignored?
Which of the following sets of characteristics would usually best describe an autoregressive process of order 3 (i.e. an AR(3))?
A process, xt, which has a constant mean and variance, and zero autocovariance for all non-zero lags is best described as:
If a regression equation contains an irrelevant variable, the parameter estimates will be
A normal distribution has coefficients of skewness and excess kurtosis which are respectively:
If a residual series is negatively autocorrelated, which one of the following is the most likely value of the Durbin Watson statistic?
Consider the following picture and suggest the model from the following list that best characterises the process:
If the number of non-zero eigenvalues of the pi matrix under a Johansen test is 2, this implies that
What is the optimal three-step ahead forecast from the AR(2) model given in question 14?
Consider a series that follows an MA(1) with zero mean and a moving average coefficient of 0.4. What is the value of the autocorrelation function at lag 1?
Which criticism of Dickey-Fuller (DF) -type tests is addressed by stationarity tests, such as the KPSS test?
Which one of the following best describes most series of asset prices?
If the residuals of a model containing lags of the dependent variable are autocorrelated, which one of the following could this lead to?
