d_RSC: First derivatives of the IRF of the one-parameter RSC model.

Description Usage Arguments Value

View source: R/cIRF_functions.R

Description

Computes a named list of derivatives of the IRF of the one-parameter RSC model. Uses 2PL model for individual responses.

Usage

1
d_RSC(u, parms, theta1, theta2)

Arguments

u

the logit of the weight parameter of the RSC model.

parms

a data.frame with columns parms$alpha and parms$beta corresponding to the discrimination and difficulty parameters of the 2PL model, respectively.

theta1

the latent trait of member 1.

theta2

the latent trait of member 2.

Value

a named list of derivatives, with elements c("dw", "dtheta1", "dtheta2").


peterhalpin/cirt documentation built on July 15, 2018, 12:42 p.m.