## 4.1 Introduction to Time Series Plots

### Time Series Plots

**Time series plots**are a specific type of graph, where**the explanatory variable is time**.- They are used to analyse how a system changes over time.
- When describing a time series plot, the
**trend, seasonality, irregular fluctuations, structural change and outliers**are all important aspects. - Time series plots can either be shown as a graph with data points connected by lines, or as a dot plot.