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geyser: Old Faithful Geyser Data

Description Usage Format References See Also


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 1st August to 15th August 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 minutes
waiting numeric Waiting time before the eruption, in minutes

Note that in versions of the sm package before 2.2-5 the waiting variable was incorrectly described as ‘waiting time to next eruption’.


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

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