probability.1pl: 1PL probability function
In SICSresearch/IRTpp: Estimating IRT Parameters using the IRT Methodology

Description Usage Arguments Value See Also Examples

The probability function in the 1PL model.

1	probability.1pl(z, b = z$b, theta)

`z`	Optional. A list with the parameter b specified by keys.
`b`	The difficulty parameter. (Optional if d is specified)
`theta`	The subject's latent trait.

Tue value of the probability for the model 1pl.

probability.2pl, probability.3pl, prob.3pl, prob.2pl

## Simulate the test
# data <- simulateTest(model = "1PL", items = 20, individuals = 200)
## item parameters
# zita <-data$itempars
## Latent traits
# thetas <- data$latentTraits
## Probability model
# probability.1pl(zita, theta = thetas)