A bivariate inhomogeneous point pattern, giving the locations of
the centres of two types of cells in a cross-section of the
gastric mucosa of a rat.
Usage
data(mucosa)
Arguments
format
An object of class "ppp", see ppp.object.
This is a multitype point pattern with two types of points,
ECL and other.
source
Dr Thomas Berntsen and Prof Rasmus Waagepetersen.
Details
This point pattern dataset gives the locations of
cell centres in a cross-section of the gastric mucosa (mucous membrane of the
stomach) of a rat. The rectangular observation window has been scaled
to unit width. The lower edge of the window is closest to the outside
of the stomach.
The cells are classified into two types: ECL cells
(enterochromaffin-like cells) and other cells. There are 86 ECL cells
and 807 other cells in the dataset.
ECL cells are a type of neuroendocrine cell which
synthesize and secrete histamine.
One hypothesis of interest is whether the
spatially-varying intensities of ECL cells and other cells are
proportional.
The data were originally collected by Dr Thomas Berntsen.
The data were discussed and analysed in Moller and Waagepetersen (2004,
pp. 2, 169).
The associated object mucosa.subwin is the smaller window
to which the data were restricted for analysis by Moller and Waagepetersen.
References
Moller, J. and Waagepetersen, R. (2004).
Statistical Inference and Simulation for Spatial Point Processes.
Chapman and Hall/CRC.