Time series

The table shows the number of visitors per quarter (per three months) to a seaside town.

Quarter (year)1 (2005)2 (2005)3 (2005)4 (2005)1 (2006)2 (2006)3 (2006)4 (2006)
Visitors (thousands)1424981222117

If this data is plotted onto a graph, this will be a time series graph, as it shows the frequencies over time.

Graph of annual quarter vs number of visitors

From the graph, it can be seen that there is a large fluctuation each year in the amount of visitors. However, there is a pattern that repeats each year. For example, many more people visit in the summer months than they do in the winter months, and this is the same year by year.