Hughes' Amacrine Cell Data
Austin Hughes' data: a point pattern of displaced amacrine cells in the retina of a rabbit. A marked point pattern.
data(amacrine)
An object of class "ppp"
representing the point pattern of cell locations.
Entries include
x |
Cartesian x-coordinate of cell |
y |
Cartesian y-coordinate of cell |
marks |
factor with levels off and on |
| indicating ``off'' and ``on'' cells |
See ppp.object for details of the format.
Austin Hughes' data: a point pattern of displaced amacrine cells in the retina of a rabbit. 152 “on” cells and 142 “off” cells in a rectangular sampling frame.
The true dimensions of the rectangle are 1060 by 662 microns. The coordinates here are scaled to a rectangle of height 1 and width 1060/662 = 1.601 so the unit of measurement is approximately 662 microns.
The data were analysed by Diggle (1986).
Peter Diggle, personal communication
Diggle, P. J. (1986). Displaced amacrine cells in the retina of a rabbit: analysis of a bivariate spatial point pattern. J. Neurosci. Meth. 18, 115–125.
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