Answer
A variable, discrete or continuous, should be dependent on time.
The time-series plot helps to determine the trend of a time-dependent variable that can be constant, rising, or declining over time.
Work Step by Step
The value of a security or stock will vary at different time periods. When the value of this variable is tracked and monitored to obtain concrete conclusions about its movement, it gives rise to time-series data. The time-series plot can be obtained by plotting values that help in determining the trend of that variable.
