plotAdjacent {ShinyItemAnalysis} | R Documentation |
Function for plotting category probabilities function estimated
by vglm()
function from the VGAM
package using the
ggplot2 package.
plotAdjacent(x, matching.name = "matching")
x |
object of class |
matching.name |
character: name of matching criterion used for
estimation in |
An object of class ggplot
and/or gg
.
Tomas Jurica
Institute of Computer Science of the Czech Academy of Sciences
Adela Hladka
Institute of Computer Science of the Czech Academy of Sciences
hladka@cs.cas.cz
Patricia Martinkova
Institute of Computer Science of the Czech Academy of Sciences
martinkova@cs.cas.cz
# loading packages library(VGAM) # loading data data(Science, package = "mirt") # total score calculation score <- rowSums(Science) Science[, 1] <- factor(Science[, 1], levels = sort(unique(Science[, 1])), ordered = TRUE) # adjacent category logit model for item 1 fit <- vglm(Science[, 1] ~ score, family = acat(reverse = FALSE, parallel = TRUE)) # coefficients for item 1 coef(fit) plotAdjacent(fit, matching.name = "Total score")