api-tabNew function

Create multidimensional arrays

Alternative ways of creating arrays

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: 1. 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.

Returns

An array.

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.

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

Author(s)

Søren Højsgaard, sorenh@math.aau.dk