grafi_wrightmap: Wright Map for items difficulty and person ability

In jsaraviadrago/bluegrafir: Psychometric tools for structural equation models and scale comparisons

Description

This function needs two vectors (person's abilities and items difficulties). With that information it will make a nice wright map

Usage

grafi_wrightmap(persons.measure, items.measure, items.names, groups = 5)

Arguments

persons.measure	Person's abilities
items.measure	Item's difficulties
items.names	Item's names
groups	amounts of groups that the items are seperated

Value

a ggplot histogram of amount of people and a grapha of item difficulty

Author(s)

Juan Carlos Saravia

Examples

personas.data <- data.frame(personas=sort(round(rnorm(500, 0,1),3)))

items.data <- data.frame(
  items_n = as.numeric(seq(1:36)),
  items_g = ceiling(runif(36, 0, 5)),
  items = sort(round(runif(36, -3,3),3)),
  stringsAsFactors=F)
items.data <- cbind(items.data,
                    items_c = dplyr::if_else(items.data$items_n < 10,
                     paste("IT_EX",items.data$items_n, sep="_0"),
                                     paste("IT_EX",items.data$items_n, sep="_")))


grafi_wrightmap(personas.data$personas,items.data$items,items.data$items_c)

jsaraviadrago/bluegrafir documentation built on July 20, 2020, 3:01 a.m.