Compute pairwise frequencies

Compute pairwise frequencies

Usage

pairs_freq(Y, C_VEC)

Arguments

Y

Integer matrix of dimension \(n*p\), where \(n\) is the sample size and \(p\) is the number of items considered. Categories must be coded starting from zero. For example, an item with three categories can only accept values contained in \(\{0, 1, 2\}\).

C_VEC

Integer vector indicating how many possible categories are associated to each item in 'Y'.

Value

It returns a 5-rows matrix with each combination of items and categories as columns. Row0: item k, Row1: item l, Row2; category item k, Row3: category item l, Row4: freq It is computed just once, before the optimization of the complete pairwise