polychoric {exametrika} | R Documentation |
Polychoric Correlation
Description
Calculate the polychoric correlation coefficient between two polytomous (categorical ordinal) variables. Polychoric correlation estimates the correlation between two theorized normally distributed continuous latent variables from two observed ordinal variables.
Usage
polychoric(x, y)
Arguments
x |
A polytomous vector (categorical ordinal variable) |
y |
A polytomous vector (categorical ordinal variable) |
Details
This function handles missing values (coded as -1 or NA) using pairwise deletion. The estimation uses maximum likelihood approach with Brent's method for optimization.
Value
The polychoric correlation coefficient between x and y
Examples
# Example with simulated data
set.seed(123)
x <- sample(1:5, 100, replace = TRUE)
y <- sample(1:4, 100, replace = TRUE)
polychoric(x, y)
[Package exametrika version 1.5.1 Index]