exametrika (version 1.1.0)

TetrachoricCorrelationMatrix: Tetrachoric Correlation Matrix

Description

Calculates the matrix of tetrachoric correlations between all pairs of items. Tetrachoric Correlation is superior to the phi coefficient as a measure of the relation of an item pair. This function is applicable only to binary response data.

Usage

TetrachoricCorrelationMatrix(U, na = NULL, Z = NULL, w = NULL, ...)

Value

A matrix of tetrachoric correlations with exametrika class. Each element (i,j) represents the tetrachoric correlation between items i and j. The matrix is symmetric with ones on the diagonal.

Arguments

U

U is a data matrix of the type matrix or data.frame.

na

na argument specifies the numbers or characters to be treated as missing values.

Z

Z is a missing indicator matrix of the type matrix or data.frame

w

w is item weight vector

...

Internal parameters for maintaining compatibility with the binary data processing system. Not intended for direct use.

Examples

# \donttest{
# example code
TetrachoricCorrelationMatrix(J15S500)
# }