Description Usage Arguments Value See Also Examples
The probability function in the 2PL model.
1 | prob.2pl(z, theta)
|
z |
List containing the item parameters a and d |
theta |
Vector, contains the latent traits of the individual |
The value of the probability for the 2PL model.
probability.2pl
, prob.3pl
,
probability.3pl
, probability.1pl
1 2 3 4 5 6 7 8 9 10 11 12 | ## Simulate the test
# data <- simulateTest(model = "2PL", items = 20, individuals = 200)
## item parameters
# zita <-data$itempars
# zita <- list(zita$a, zita$b, zita$c)
## transformation of the parameter b
# zita <- model.transform(zita, model = "3PL", src = "b", target = "d")
# zita <- list(a = zita[,1], d = zita[,1], c = zita[,1])
## Latent traits
# thetas <- data$latentTraits
## Probability model
# prob.2pl(zita, thetas)
|
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