ewens: Partition Distributions

In shallot: Random Partition Distribution Indexed by Pairwise Information

Description

These functions specify the Ewens, Ewens-Pitman, Ewens attraction, Ewens-Pitman attraction, and ddCRP distributions which would then be used in the sample.partitions function.

Usage

ewens(mass, n.items, names = paste0("c", 1:n.items))

## S3 method for class 'shallot.distribution.ewens'
print(x, ...)

ewens.pitman(mass, discount, n.items, names = paste0("c", 1:n.items))

## S3 method for class 'shallot.distribution.ewensPitman'
print(x, ...)

ewens.attraction(mass, attraction)

## S3 method for class 'shallot.distribution.ewensAttraction'
print(x, ...)

ewens.pitman.attraction(mass, discount, attraction)

## S3 method for class 'shallot.distribution.ewensPitmanAttraction'
print(x, ...)

ddcrp(mass, attraction)

## S3 method for class 'shallot.distribution.ddcrp'
print(x, ...)

Arguments

mass	An object of class shallot.mass.
n.items	An integer containing the number of items to partition.
names	A character vector containing the names of the items. The default names are of the form “c1”, “c2”, etc.
x	An object of class shallot.distribution.
...	Currently ignored.
discount	An object of class shallot.discount.
attraction	An object of class shallot.attraction.

Value

An object of class shallot.distribution.

Author(s)

David B. Dahl [e-mail]

References

Dahl, D. B., Day, R., and Tsai, J. (2017), Random Partition Distribution Indexed by Pairwise Information, Journal of the American Statistical Association, 112, 721-732. <DOI:10.1080/01621459.2016.1165103>

See Also

mass, discount, attraction, sample.partitions

Examples

pd1 <- ewens(mass(1),50)

decay <- decay.exponential(temperature(1.0),dist(scale(USArrests)))
attraction <- attraction(permutation(n.items=50,fixed=FALSE), decay)
pd2 <- ewens.pitman.attraction(mass(1), discount(0.05), attraction)

pd3 <- ddcrp(mass(1), attraction)

shallot documentation built on Nov. 10, 2020, 5:09 p.m.