![Estimate polychoric correlation by maximum likelihood estimation](https://blogs.sas.com/content/iml/files/2023/12/polychor5-480x336.png)
SAS provides many built-in routines for data analysis. A previous article discusses polychoric correlation, which is a measure of association between two ordinal variables. In SAS, you can use PROC FREQ or PROC CORR to estimate the polychoric correlation, its standard error, and confidence intervals. Although SAS provides a built-in