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8.2.45.23 octave.dataset.faithful ¶

Static Method: out = faithful () ¶

Old Faithful Geyser Data

Description ¶

Waiting time between eruptions and the duration of the eruption for the Old Faithful geyser in Yellowstone National Park, Wyoming, USA.

Format ¶

eruptions

Eruption time (mins).

waiting

Waiting time to next eruption (mins).

Source ¶

W. Härdle.

References ¶

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.

Examples ¶

t = octave.dataset.faithful;

% Munge the data, rounding eruption time to the second
e60 = 60 * t.eruptions;
ne60 = round (e60);
# TODO: Port zapsmall to Octave
eruptions = ne60 / 60;
# TODO: Display mean relative difference and bins summary

% Histogram of rounded eruption times
figure
hist (ne60, max (ne60))
xlabel ("Eruption time (sec)")
ylabel ("n")
title ("faithful data: Eruptions of Old Faithful")

% Scatter plot of eruption time vs waiting time
figure
scatter (t.eruptions, t.waiting)
xlabel ("Eruption time (min)")
ylabel ("Waiting time to next eruption (min)")
title ("faithful data: Eruptions of Old Faithful")
# TODO: Port Lowess smoothing to Octave