faithful | R Documentation |
Waiting time between eruptions and the duration of the eruption for the Old Faithful geyser in Yellowstone National Park, Wyoming, USA.
faithful
A data frame with 272 observations on 2 variables.
[,1] | eruptions | numeric | Eruption time in mins |
[,2] | waiting | numeric | Waiting time to next eruption (in mins) |
A closer look at faithful$eruptions
reveals that these are
heavily rounded times originally in seconds, where multiples of 5 are
more frequent than expected under non-human measurement. For a
better version of the eruption times, see the example below.
There are many versions of this dataset around: Azzalini and Bowman (1990) use a more complete version.
W. Härdle.
Härdle, W. (1991) Smoothing Techniques with Implementation in S. New York: Springer.
Azzalini, A. and Bowman, A. W. (1990). A look at some data on the Old Faithful geyser. Applied Statistics 39, 357–365.
geyser
in package MASS for the Azzalini–Bowman version.
require(stats); require(graphics) f.tit <- "faithful data: Eruptions of Old Faithful" ne60 <- round(e60 <- 60 * faithful$eruptions) all.equal(e60, ne60) # relative diff. ~ 1/10000 table(zapsmall(abs(e60 - ne60))) # 0, 0.02 or 0.04 faithful$better.eruptions <- ne60 / 60 te <- table(ne60) te[te >= 4] # (too) many multiples of 5 ! plot(names(te), te, type = "h", main = f.tit, xlab = "Eruption time (sec)") plot(faithful[, -3], main = f.tit, xlab = "Eruption time (min)", ylab = "Waiting time to next eruption (min)") lines(lowess(faithful$eruptions, faithful$waiting, f = 2/3, iter = 3), col = "red")