ganglia: Beta Ganglion Cells in Cat Retina, Old Version
In spatstat.data: Datasets for 'spatstat' Family
ganglia R Documentation
Beta Ganglion Cells in Cat Retina, Old Version
Description
Point pattern of retinal ganglion cells identified as ‘on’ or ‘off’.
A marked point pattern.
Usage
data(ganglia)
Format
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.
Notes
Important: these data are INCORRECT. See below.
The data represent a pattern of beta-type ganglion cells in the
retina of a cat recorded in Figure 6(a) of W\"assle et al. (1981).
The pattern was first analysed by W\"assle et al (1981) using
nearest neighbour distances. The data used in their analysis
are not available.
The present dataset ganglia was
scanned from Figure 6(a) of W\"assle et al (1981)
in the early 1990's, but we have no further information.
This dataset is the one analysed by Van Lieshout and Baddeley (1999)
using multitype J functions, and by Stoyan (1995) using second
order methods (pair correlation and mark correlation).
It has now been discovered that these data are incorrect.
They are not faithful to the scale in Figure 6 of W\"assle et al (1981),
and they contain some scanning errors.
Hence they should not be used to address the original scientific question.
They have been retained only for comparison with other analyses
in the statistical literature.
A new, corrected dataset, scanned from the original microscope image,
has been provided under the name betacells. Use that
dataset for any further study.
Warnings
These data are incorrect.
Use the new corrected dataset betacells.
Source
W\"assle et al (1981), data supplied by Marie-Colette van
Lieshout and attributed to Peter Diggle
References
Stoyan, D. (1995) Personal communication.
Van Lieshout, M.N.M. and Baddeley, A.J. (1999) Indices of
dependence between types in multivariate point patterns.
Scandinavian Journal of Statistics 26, 511–532.
W\"assle, H., Boycott, B. B. & Illing, R.-B. (1981). Morphology
and mosaic of on- and off-beta cells in the cat retina and some
functional considerations. Proc. Roy. Soc. London Ser. B
212, 177–195.
spatstat.data documentation built on May 29, 2024, 9:10 a.m.
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| ganglia | R Documentation |
Beta Ganglion Cells in Cat Retina, Old Version
Description
Point pattern of retinal ganglion cells identified as ‘on’ or ‘off’. A marked point pattern.
Usage
data(ganglia)Format
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.
Notes
Important: these data are INCORRECT. See below.
The data represent a pattern of beta-type ganglion cells in the retina of a cat recorded in Figure 6(a) of W\"assle et al. (1981).
The pattern was first analysed by W\"assle et al (1981) using nearest neighbour distances. The data used in their analysis are not available.
The present dataset ganglia was
scanned from Figure 6(a) of W\"assle et al (1981)
in the early 1990's, but we have no further information.
This dataset is the one analysed by Van Lieshout and Baddeley (1999)
using multitype J functions, and by Stoyan (1995) using second
order methods (pair correlation and mark correlation).
It has now been discovered that these data are incorrect. They are not faithful to the scale in Figure 6 of W\"assle et al (1981), and they contain some scanning errors. Hence they should not be used to address the original scientific question. They have been retained only for comparison with other analyses in the statistical literature.
A new, corrected dataset, scanned from the original microscope image,
has been provided under the name betacells. Use that
dataset for any further study.
Warnings
These data are incorrect.
Use the new corrected dataset betacells.
Source
W\"assle et al (1981), data supplied by Marie-Colette van Lieshout and attributed to Peter Diggle
References
Stoyan, D. (1995) Personal communication.
Van Lieshout, M.N.M. and Baddeley, A.J. (1999) Indices of dependence between types in multivariate point patterns. Scandinavian Journal of Statistics 26, 511–532.
W\"assle, H., Boycott, B. B. & Illing, R.-B. (1981). Morphology and mosaic of on- and off-beta cells in the cat retina and some functional considerations. Proc. Roy. Soc. London Ser. B 212, 177–195.
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