Introduce gganimate for Psychometric

A new R packge (gganimate ) provides some new features for animation in R. Its big advantage is it could make use of ggplot API and embeded into ggplot. Next, I will use a sample data to show the example. Then I will use some real educational data to explore a little bit what we can do in psychometric area.

A Simple Example

I want to introduce this package.

1.0 Load the packages requried

1.1 prepare the data

dt <- data.frame(x=as.matrix(austres), date=time(austres))
dt$y <- rnorm(nrow(dt))
dt$date  <- as.numeric(dt$date)
p <- ggplot(dt,
            aes(y = y, x =x)) +
  geom_line(alpha = 0.7) +

transition_reveal: gradually reveal the data

p + transition_reveal(date)

dt$g <- rep( c("red", "green", "blue"), length.out = nrow(dt))
p_bygroup <- ggplot(dt,
            aes(y = y, x =x, col = g)) +
  geom_line(alpha = 0.7) +
p_bygroup + transition_reveal(date)

Jihong Zhang, M.S.
Jihong Zhang, M.S.
Ph.D. Candidate

My research interests mainly focus on the Bayesian Diagnostic Classification Models (DCMs) - a special kind of Item Response Model and the model checking method, 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.