smr_stat: Summary Statistics

In mrf2d: Markov Random Field Models for Image Analysis

Description

Computes the summary count statistics of a field given an interaction structure and a restriction family.

• cohist() computes the co-ocurrence histogram.

• smr_stat() computes the co-ocurrence histogram, then converts it into a vector of sufficient statistics given a family of restrictions.

Usage

smr_stat(Z, mrfi, family)

cohist(Z, mrfi)

vec_description(mrfi, family, C)

Arguments

Z	A matrix object containing the observed MRF. NA values can be used to create a subregion of the lattice for non-rectangular data.
mrfi	A mrfi object representing the interaction structure.
family	The family of parameter restrictions to potentials. Families are: 'onepar', 'oneeach', 'absdif', 'dif' or 'free'. See mrf2d-familiy.
C	The maximum value of the field.

Details

The order the summarized counts appear in the summary vector matches the order in smr_array().

Value

A numeric vector with the summarized counts.

An array representing the co-ocurrence histogram of Z in the relative positions contained in mrfi. Each row and column corresponds a pair of values in (0, ..., C) and each slice corresponds to

A data.frame describing the relative position and interaction associated with each potential in the vector form in each row, in the same order.

Author(s)

Victor Freguglia

See Also

A paper with detailed description of the package can be found at doi: 10.18637/jss.v101.i08

Examples

smr_stat(Z_potts, mrfi(1), "onepar")
smr_stat(Z_potts, mrfi(1), "oneeach")

cohist(Z_potts, mrfi(1))

mrf2d documentation built on Jan. 26, 2022, 1:06 a.m.