context("nextItem-PKL")
load("cat_objects.Rdata")
test_that("ltm nextItem PKL calculates correctly", {
ltm_cat@estimation <- "EAP"
ltm_cat@selection <- "PKL"
ltm_cat@answers[c(1:7,27,36)] <- c(0, 1, 0, 0, 1, 0, 0, 1, 1)
package_next <- selectItem(ltm_cat)
package_item <- package_next$next_item
package_est <- package_next$estimates[package_next$estimates$q_number
== package_item, "PKL"]
expect_equal(package_item, 40)
expect_equal(round(package_est, 6), 0.000218)
})
test_that("grm nextItem PKL calculates correctly", {
grm_cat@estimation <- "EAP"
grm_cat@selection <- "PKL"
grm_cat@answers[c(1:8,14,17)] <- c(3, 4, 2, 2, 1, 2, 2, 3, 4, 4)
package_next <- selectItem(grm_cat)
package_item <- package_next$next_item
package_est <- package_next$estimates[package_next$estimates$q_number
== package_item, "PKL"]
expect_equal(package_item, 10)
expect_equal(round(package_est, 8), 3e-08)
})
test_that("nextItem PKL chooses item (not NA) when no questions asked", {
ltm_cat@selection <- "PKL"
grm_cat@selection <- "PKL"
gpcm_cat@selection <- "PKL"
expect_true(!is.na(selectItem(ltm_cat)$next_item))
expect_true(!is.na(selectItem(grm_cat)$next_item))
expect_true(!is.na(selectItem(gpcm_cat)$next_item))
})
test_that("nextItem PKL estimates are not NA (when no questions asked)", {
ltm_cat@selection <- "PKL"
grm_cat@selection <- "PKL"
gpcm_cat@selection <- "PKL"
expect_equal(sum(!is.na(selectItem(ltm_cat)$estimates[,"PKL"])), 40)
expect_equal(sum(!is.na(selectItem(grm_cat)$estimates[,"PKL"])), 18)
expect_equal(sum(!is.na(selectItem(gpcm_cat)$estimates[,"PKL"])), 10)
})
test_that("nextItem PKL is actually the maximum estimate", {
ltm_cat@selection <- "PKL"
grm_cat@selection <- "PKL"
gpcm_cat@selection <- "PKL"
ltm_next <- selectItem(ltm_cat)
grm_next <- selectItem(grm_cat)
gpcm_next <- selectItem(gpcm_cat)
expect_equal(ltm_next$next_item, which(ltm_next$estimates[, "PKL"] ==
max(ltm_next$estimates[, "PKL"])))
expect_equal(grm_next$next_item, which(grm_next$estimates[, "PKL"] ==
max(grm_next$estimates[, "PKL"])))
expect_equal(gpcm_next$next_item, which(gpcm_next$estimates[, "PKL"] ==
max(gpcm_next$estimates[, "PKL"])))
})
test_that("nextItem PKL correctly skips questions", {
ltm_cat@selection <- "PKL"
grm_cat@selection <- "PKL"
gpcm_cat@selection <- "PKL"
ltm_cat@answers[1:10] <- c(rep(-1, 5), 1, 1, 0, 0, 1)
grm_cat@answers[1:5] <- c(-1, -1, 5, 4, 3)
gpcm_cat@answers[1:5] <- c(-1, -1, 5, 4, 3)
ltm_next <- selectItem(ltm_cat)
grm_next <- selectItem(grm_cat)
gpcm_next <- selectItem(gpcm_cat)
expect_equal(nrow(ltm_next$estimates) + sum(!is.na(ltm_cat@answers)),
length(ltm_cat@answers))
expect_equal(nrow(grm_next$estimates) + sum(!is.na(grm_cat@answers)),
length(grm_cat@answers))
expect_equal(nrow(gpcm_next$estimates) + sum(!is.na(gpcm_cat@answers)),
length(gpcm_cat@answers))
})
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