The placement of anemones on their shells by hermit crabs.
data(CrabShells2)A data frame with 4 rows and 3 columns:
The column where anemone placed;
one of 1 (Side) or 2 (Central)
The row where anemone placed;
one of 1 (Side) or 2 (Central)
The number of anemones in the indicated sector on the shell
The data provide the number of anemones placed on their shell by
hermit crabs in indicated regions.
Roughly, the shells are divided into a 3x3 grid of approximately
equal areas (see CrabShell3) but here the 3x3 table has been
collapsed to a 2x2 table.