Hughes' Cat Retina Data
Austin Hughes' data: a point pattern of ganglion cells in the retina of a cat. A marked point pattern.
An object of class
representing the point pattern of cell locations.
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.
ppp.object for details of the format.
Peter Diggle, personal communication
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.