classicaltest (version 0.7.5)

ctperson: Classical test theory person statistics

Description

Calculates persons statistics given a data frame (or matrix) of corrected data. Including sum scores, number of administered items, number of answered items, proportion of correct items, and mean score by item.

Usage

ctperson(x, administered = NULL, maxscore = NULL)

Value

A data frame with person statistics.

Arguments

x

a data frame or matrix of scored data.

administered

a logical matrix indicating which items were administered. The dimensions should be the same as x. If NULL all items are considered administered.

maxscore

a numeric value indicating which is the maximum score possible per item. The minimum score is assumed to be 0. If NULL the maximum score is assumed to be derived from the maximum value found in x or 1 if x only has 0s.

Examples

# Data preparation
## Scored data
corr <- correct(x = dichodata, key = dichokey, navalue = NA)
## Random administered matrix
set.seed(1919)
admin <- sample(x = 0:1, size = nrow(corr)*ncol(corr), replace = TRUE, prob = c(.05,.95))
admin <- matrix(data = as.logical(admin),nrow = nrow(corr))
head(admin)


# Person statistics with all items administered
ex1 <- ctperson(x = corr)
head(ex1)

# Person statistics with NOT all items administered
ex2 <- ctperson(x = corr, administered = admin)
head(ex2)