Visuliaztion of Item Information Curves In R

Last updated on May 2, 2022 1 min read blog

Item Information Curve

This blog is to show a new way to display item information curves using ggridges package. The ridge plot could show the IIF plots very clear when you have a large number of items.

ggplot(item_information_all %>% filter(item %in% 17:22)) +
  aes(x = factor, y = item, height = info, 
      group = item, color = as.factor(item), 
      fill = as.factor(item)) +
  ggridges::geom_ridgeline(alpha = 0.75) +
  ggtitle("Peer Social Capital: Information Functions")  +
  theme_ridges()
R ggplot2
Jihong Zhang, PhD
Jihong Zhang, PhD
Postdoctoral Research Fellow

My research interests focus on the Bayesian Diagnostic Classification Models (DCMs) and other psychometric modeling, as applied in the psychological, educational, and social sciences. I seek to improve the utility of advanced psychometric modeling and provide easy-to-use tools or software for researchers.