api-tabNew: Create multidimensional arrays

In gRbase: A Package for Graphical Modelling in R

Create multidimensional arrays

Description

Alternative ways of creating arrays

Usage

tabNew(names, levels, values, normalize = "none", smooth = 0)

Arguments

names	Names of variables defining table; either a character vector or a right hand sided formula.
levels	a list with specification of the levels of the factors in names or 2) a vector with number of levels of the factors in names. See 'examples' below.
values	values to go into the array.
normalize	Either "none", "first" or "all". Should result be normalized, see 'Details' below.
smooth	Should values be smoothed, see 'Details' below.

Details

1. If normalize="first" then for each configuration of all other variables than the first, the probabilities are normalized to sum to one. Thus f(a, b, c) becomes a conditional probability table of the form p(a | b, c).

2. If normalize="all" then the sum over all entries of f(a,b,c) is one.

3. If smooth is positive then smooth is added to values BEFORE normalization takes place.

Value

An array.

Author(s)

Søren Højsgaard, [e-mail]

Examples

universe <- list(gender=c('male', 'female'),
                 answer=c('yes', 'no'),
                 rain=c('yes', 'no'))
t1 <- tabNew(c("gender", "answer"), levels=universe, values=1:4)
t1
t2 <- tabNew(~gender:answer, levels=universe, values=1:4)
t2
t3 <- tabNew(~gender:answer, c(2, 2), values=1:4)
t3

gRbase documentation built on Oct. 22, 2024, 5:06 p.m.