probability.2pl: 2PL probability function The probability function in the 3PL...

Description Usage Arguments

Description

2PL probability function The probability function in the 3PL model.

Usage

1
probability.2pl(z, a = z$a, b = z$b, theta, d = -a * b)

Arguments

z

Optional. A list with the parameters a and b specified by keys.

a

The discrimination parameter

b

The difficulty parameter. (Optional if d is specified)

theta

The subject's latent trait.

d

Optional. Overrides the b parameter, it is equal to -a*b. Used in some functions.


SICSresearch/IRTpp_old documentation built on May 9, 2019, 11:12 a.m.