catHughes: Hughes' Cat Retina Data
Description
Austin Hughes' data: a point pattern
of ganglion cells in the retina of a cat.
A marked point pattern.format
An object of class "ppp"
representing the point pattern of cell locations.
Entries include
ll{
x
Cartesian $x$-coordinate of cell
y
Cartesian $y$-coordinate of cell
marks
factor with levels 0 and 1 indicating
``off'' and ``on'' cells respectively.
}
See ppp.object
for details of the format.source
Peter Diggle, personal communicationNotes
Austin Hughes' data: a point pattern
of ganglion cells in the retina of a cat.
152 ``on'' cells and 142 ``off'' cells in a rectangle
with dimensions 1.6065 by 1.0 where the unit of measurement
is approximately 1 mm.