geyser {MASS}R Documentation

Old Faithful Geyser Data


A version of the eruptions data from the ‘Old Faithful’ geyser in Yellowstone National Park, Wyoming. This version comes from Azzalini and Bowman (1990) and is of continuous measurement from August 1 to August 15, 1985.

Some nocturnal duration measurements were coded as 2, 3 or 4 minutes, having originally been described as ‘short’, ‘medium’ or ‘long’.




A data frame with 299 observations on 2 variables.

duration numeric Eruption time in mins
waiting numeric Waiting time for this eruption


The waiting time was incorrectly described as the time to the next eruption in the original files, and corrected for MASS version 7.3-30.


Azzalini, A. and Bowman, A. W. (1990) A look at some data on the Old Faithful geyser. Applied Statistics 39, 357–365.

Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth edition. Springer.

See Also


CRAN package sm.

[Package MASS version 7.3-51.4 Index]