+----------+-------------------+
| hirose   | R Documentation   |
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Failure Time of PET Film
------------------------

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

The ``hirose`` data frame has 44 rows and 3 columns.

PET film is used in electrical insulation. In this accelerated life test
the failure times for 44 samples in gas insulated transformers. 4
different voltage levels were used.

Usage
~~~~~

::

    hirose

Format
~~~~~~

This data frame contains the following columns:

``volt``
    The voltage (in kV).

``time``
    The failure or censoring time in hours.

``cens``
    The censoring indicator; ``1`` means right-censored data.

Source
~~~~~~

The data were obtained from

Hirose, H. (1993) Estimation of threshold stress in accelerated
life-testing. *IEEE Transactions on Reliability*, **42**, 650â€“657.

References
~~~~~~~~~~

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