+--------+-------------------+
| coal   | R Documentation   |
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Dates of Coal Mining Disasters
------------------------------

Description
~~~~~~~~~~~

The ``coal`` data frame has 191 rows and 1 columns.

This data frame gives the dates of 191 explosions in coal mines which
resulted in 10 or more fatalities. The time span of the data is from
March 15, 1851 until March 22 1962.

Usage
~~~~~

::

    coal

Format
~~~~~~

This data frame contains the following column:

``date``
    The date of the disaster. The integer part of ``date`` gives the
    year. The day is represented as the fraction of the year that had
    elapsed on that day.

Source
~~~~~~

The data were obtained from

Hand, D.J., Daly, F., Lunn, A.D., McConway, K.J. and Ostrowski, E.
(1994) *A Handbook of Small Data Sets*, Chapman and Hall.

References
~~~~~~~~~~

Davison, A.C. and Hinkley, D.V. (1997) *Bootstrap Methods and Their
Application*. Cambridge University Press.

Jarrett, R.G. (1979) A note on the intervals between coal-mining
disasters. *Biometrika*, **66**, 191-193.
