DTA301Xuất hiện trong 1 đề thi
A time series yt for t = 1, 2, 3, ... is a stationary time series if the following three conditions are met, except:
Các lựa chọn
AThe expected value (mean) of yt is a constant for all values of t.
BThe variance of yt is finite.
CThe covariance of yt and yt+h depends only on the value of h = 0, 1, 2, ... for all t.
DThe covariance of yt and yt+h does not depend only on the value of h = 0, 1, 2, ... for all t.