redwood: California Redwoods Point Pattern (Ripley's Subset)
In spatstat.data: Datasets for 'spatstat' Family
redwood R Documentation
California Redwoods Point Pattern (Ripley's Subset)
Description
The data represent the locations of 62 seedlings and saplings
of California Giant Redwood (Sequoiadendron giganteum)
recorded in a square sampling region.
They originate from Strauss (1975);
the present data are a subset extracted by Ripley (1977)
in a subregion that has been rescaled to a unit square.
(The original physical size of the unit is approximately 63.1 feet).
Two versions of this dataset are provided: redwood
and redwood3.
The dataset redwood was obtained from the spatial package.
In this version the coordinates are given to 2 decimal places
(multiples of 0.01 units) except for one point which has an x coordinate
of 0.999, presumably to ensure that it is properly inside the window.
The dataset redwood3 was obtained from Peter Diggle's webpage.
In this version the coordinates are given to 3 decimal places
(multiples of 0.001 units). The ordering of the points is not the same
in the two datasets.
There are many further analyses of this dataset. It is often used as a
canonical example of a clustered point pattern
(see e.g. Diggle, 1983).
The original, full redwood dataset is supplied in the spatstat.data
package as redwoodfull.
Usage
data(redwood)
Format
An object of class "ppp"
representing the point pattern of tree locations.
The window has been rescaled to the unit square.
See ppp.object for details of the format of a
point pattern object.
Source
Original data of Strauss (1975), subset extracted by Ripley (1977).
Data obtained from Ripley's package spatial
and from Peter Diggle's website.
References
Diggle, P.J. (1983)
Statistical analysis of spatial point patterns.
Academic Press.
Ripley, B.D. (1977)
Modelling spatial patterns (with discussion).
Journal of the Royal Statistical Society, Series B
39, 172–212.
Strauss, D.J. (1975)
A model for clustering.
Biometrika 62, 467–475.
See Also
redwoodfull
spatstat.data documentation built on May 29, 2024, 9:10 a.m.
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| redwood | R Documentation |
California Redwoods Point Pattern (Ripley's Subset)
Description
The data represent the locations of 62 seedlings and saplings of California Giant Redwood (Sequoiadendron giganteum) recorded in a square sampling region. They originate from Strauss (1975); the present data are a subset extracted by Ripley (1977) in a subregion that has been rescaled to a unit square. (The original physical size of the unit is approximately 63.1 feet).
Two versions of this dataset are provided: redwood
and redwood3.
The dataset redwood was obtained from the spatial package.
In this version the coordinates are given to 2 decimal places
(multiples of 0.01 units) except for one point which has an x coordinate
of 0.999, presumably to ensure that it is properly inside the window.
The dataset redwood3 was obtained from Peter Diggle's webpage.
In this version the coordinates are given to 3 decimal places
(multiples of 0.001 units). The ordering of the points is not the same
in the two datasets.
There are many further analyses of this dataset. It is often used as a canonical example of a clustered point pattern (see e.g. Diggle, 1983).
The original, full redwood dataset is supplied in the spatstat.data
package as redwoodfull.
Usage
data(redwood)Format
An object of class "ppp"
representing the point pattern of tree locations.
The window has been rescaled to the unit square.
See ppp.object for details of the format of a
point pattern object.
Source
Original data of Strauss (1975), subset extracted by Ripley (1977). Data obtained from Ripley's package spatial and from Peter Diggle's website.
References
Diggle, P.J. (1983) Statistical analysis of spatial point patterns. Academic Press.
Ripley, B.D. (1977) Modelling spatial patterns (with discussion). Journal of the Royal Statistical Society, Series B 39, 172–212.
Strauss, D.J. (1975) A model for clustering. Biometrika 62, 467–475.
See Also
redwoodfull
R Package Documentation
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