A time series of the numbers of users connected to the Internet through a server every minute.
A time series of length 100.
Durbin, J. and Koopman, S. J. (2001). Time Series Analysis by State Space Methods. Oxford: Oxford University Press. http://www.ssfpack.com/dkbook/
Makridakis, S., Wheelwright, S. C. and Hyndman, R. J. (1998). Forecasting: Methods and Applications. New York: Wiley.
# TODO: Come up with example code here