addTobca: Add some elements of 0 mass to an existing mass function

Description Usage Arguments Value Author(s) Examples

View source: R/addTobca.R

Description

Given a previously defined bca, the user may want to add some elements of the set of possible values or some subsets, even if they have zero mass value. This feature is useful, for example, to examine the plausibility results of these elements or subsets of zero mass value.

Usage

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addTobca(x, f)

Arguments

x

A basic chance assignment mass function (see bca). It can also be the normalized result of the combination of two mass functions by Dempster's Rule.

f

A matrix constructed in a boolean style (0,1) or a boolean matrix. The number of columns of the matrix f must match the number of columns of the tt matrix of x (see bca). Each row of the matrix identify a subset of the set of possible values.

Value

The original bca mass function x augmented with the added subsets defined by f.

Author(s)

Claude Boivin, Stat.ASSQ

Examples

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y <- bca(f=matrix(c(1,0,0,1,1,1),nrow=2, byrow = TRUE), 
m=c(0.6, 0.4),  cnames = c("a", "b", "c"), varnb=1)
addTobca(y, matrix(c(0,1,0,0,0,1, 0,1,1), nrow=3, byrow = TRUE))
x <- bca(f=matrix(c(0,1,1,1,1,0,1,1,1),nrow=3, 
byrow = TRUE), m=c(0.2,0.5, 0.3), 
cnames =c("a", "b", "c"), varnb=1)
xy <- dsrwon(x,y)
xy1 <- addTobca(nzdsr(xy), matrix(c(0,1,0,0,0,1), nrow=2, byrow = TRUE))
xy1
addTobca(x, f = diag(1,  ncol(x$tt) ) ) # add all singletons

dst documentation built on April 26, 2018, 1:03 a.m.