datasets (version 3.3.1)

WWWusage: Internet Usage per Minute

Description

A time series of the numbers of users connected to the Internet through a server every minute.

Usage

WWWusage

Arguments

Format

A time series of length 100.

Source

Durbin, J. and Koopman, S. J. (2001) Time Series Analysis by State Space Methods. Oxford University Press. http://www.ssfpack.com/dkbook/

References

Makridakis, S., Wheelwright, S. C. and Hyndman, R. J. (1998) Forecasting: Methods and Applications. Wiley.

Examples

Run this code
require(graphics)
work <- diff(WWWusage)
par(mfrow = c(2, 1)); plot(WWWusage); plot(work)
## Not run: 
# require(stats)
# aics <- matrix(, 6, 6, dimnames = list(p = 0:5, q = 0:5))
# for(q in 1:5) aics[1, 1+q] <- arima(WWWusage, c(0, 1, q),
#     optim.control = list(maxit = 500))$aic
# for(p in 1:5)
#    for(q in 0:5) aics[1+p, 1+q] <- arima(WWWusage, c(p, 1, q),
#        optim.control = list(maxit = 500))$aic
# round(aics - min(aics, na.rm = TRUE), 2)
# ## End(Not run)

Run the code above in your browser using DataCamp Workspace