WWWusage {datasets} | R Documentation

## Internet Usage per Minute

### Description

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

### Usage

    WWWusage

### 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

    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)

[Package datasets version 3.3.0 Index]