A time series (시계열) is a series of data points indexed (or listed or graphed) in time order. Most commonly, a time series is a sequence taken at successive equally spaced points in time. Thus it is a sequence of discrete-time data. (https://en.wikipedia.org/wiki/Time_series)

시계열 데이터 분석에 많이 쓰이는 3가지 수학 모델이 있다.

- Autoregress (AR) 모델
- Integrated (I) 모델
- Moving average (MA) 모델

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