All of the following are true about a stationary time series except
A) its statistical properties are independent of time.
B) a plot of the time series will always exhibit a horizontal pattern.
C) the process generating the data has a constant mean.
D) there is no variability in the time series over time.

Question

All of the following are true about a stationary time series except​
A) ​its statistical properties are independent of time.
B) ​a plot of the time series will always exhibit a horizontal pattern.
C) ​the process generating the data has a constant mean.
D) ​there is no variability in the time series over time.

Quizplus · Accepted Answer

A stationary time series is characterized by a constant mean, constant variance, and consistent autocorrelation structure over time. However, it does not imply that there is no variability in the time series over time. Variability can still exist, but it does so in a consistent manner.

All of the Following Are True About a Stationary Time