A time-series is said to be smooth if its underlying probability distribution usually remains the same from one period to the next.

Question

Quizplus · Accepted Answer

A time-series is said to be stationary, not smooth, if its underlying probability distribution remains constant over time. Smoothness refers to the absence of volatility or fluctuations in the series, not the constancy of its probability distribution.

A Time-Series Is Said to Be Smooth If Its Underlying