iopsych (version 0.90.1)

fuseMat: The intercorrelation among items and composites made of these items.

Description

The key matrix is used to specify any number of weighted item composites. A correlation matrix of these composites and the original correlation matrix is then computed and returned.

Usage

fuseMat(r_mat, key_mat, type = "full")

Arguments

r_mat

A correlation matrix.

key_mat

A matrix with one row for each composite and one column for each item contained in r_mat. The value if each element corresponds to the weight given to an item.

type

The type of output desired.

Value

If type = cxc then a matrix of the intercorrelations between the specified composites are returned. If type = cxr then the intercorrelations between the original item and the specified composites are returned. If type = full then all the intercorrelations between both the original items and the specified composites are returned.

Examples

Rxx <- matrix(c(1.00, 0.25,  0.50,  0.61,
                0.25, 1.00,  0.30,  0.10,
                0.50, 0.30,  1.00, -0.30,
                0.61, 0.10, -0.30,  1.00), 4, 4); Rxx

# Single composite
Key <- matrix(c(1, 2, 3, -1), 1, 4); Key

fuseMat(r_mat = Rxx, key_mat = Key)

# Three composites
Key <- matrix(c(1, 2, 3, -1,
                2, 1, 0, -2,
                1, 1, 0,  0), 3, 4, byrow = TRUE)

fuseMat(Rxx, Key)