I have this example dataset that I applied MCA as follows library("FactoMineR") library("factoextra") data(poison) poison.active <- poison[1:55, 5:15] res.mca <- MCA(poison.active, graph = FALSE) The graph I want to use cronbach alpha to check the internal validity of the first dimension. I know how to do it using PCA but it is not working with… Read More How to use cronbach alpha to check the internal validity of the first dimension?