

   SSnnaaiill MMoorrttaalliittyy DDaattaa

   AArrgguummeennttss::

    Species: Snail species A (1) or B (2)

   Exposure: Exposure in weeks

    Rel.Hum: Relative humidity (4 levels)

       Temp: Temperature, in degrees Celsius (3 levels)

     Deaths: Number of deaths

          N: Number of snails exposed

   SSUUMMMMAARRYY::

        Groups of 20 snails were held for periods of 1, 2, 3 or
        4 weeks in carefully controlled conditions of tempera-
        ture and relative humidity.  There were two species of
        snail, A and B, and the experiment was designed as a 4
        by 3 by 4 by 2 completely randomized design.  At the
        end of the exposure time the snails were tested to see
        if they had survived; the process itself is fatal for
        the animals.  The object of the exercise was to model
        the probability of survival in terms of the stimulus
        variables, and in particular to test for differences
        between species.

        The data are unusual in that in most cases fatalities
        during the experiment were fairly small.

   DDAATTAA DDEESSCCRRIIPPTTIIOONN::

        The data frame contains the following components:

   SSOOUURRCCEE::

        Zoology Department, The University of Adelaide.

