#### 8.2.58.23 tblish.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 = tblish.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