Polychoric Correlation Matrix

Polychoric Correlation Matrix

Usage

PolychoricCorrelationMatrix(U, na = NULL, Z = NULL, w = NULL)

# Default S3 method
PolychoricCorrelationMatrix(U, na = NULL, Z = NULL, w = NULL)

# S3 method for class 'ordinal'
PolychoricCorrelationMatrix(U, na = NULL, Z = NULL, w = NULL)

Arguments

U

Either an object of class "exametrika" or raw data. When raw data is given, it is converted to the exametrika class with the dataFormat function.

na

Values to be treated as missing values.

Z

Missing indicator matrix of type matrix or data.frame. Values of 1 indicate observed responses, while 0 indicates missing data.

w

Item weight vector specifying the relative importance of each item.

Value

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

Examples

# \donttest{
# example code
PolychoricCorrelationMatrix(J5S1000)
#>           V1        V2        V3        V4        V5
#> V1 1.0000000 0.2456615 0.2452778 0.2906535 0.2766477
#> V2 0.2456615 1.0000000 0.2557498 0.4055238 0.2831193
#> V3 0.2452778 0.2557498 1.0000000 0.3237882 0.2087903
#> V4 0.2906535 0.4055238 0.3237882 1.0000000 0.2942859
#> V5 0.2766477 0.2831193 0.2087903 0.2942859 1.0000000
# }