sim_gen: Generate simulation binary data in IRT.

In takuizum/irtfun2: Some useful functions for IRT

Description

Generate simulation binary data in IRT.

Usage

sim_gen(
  theta,
  a = NULL,
  b = NULL,
  c = NULL,
  phi = NULL,
  para = NULL,
  item = "A",
  power = 0,
  D = 1.702
)

Arguments

theta	theta vector
a	slope parameter. Default is NULL
b	location parameter. Default is NULL
c	asymptote parameter. Default is NULL
phi	vector of hyperparameter of phi in GIRT model. Default is NULL
para	data.frame. format is same to output parameter data.frame generated by estip.
item	Character. item code.
power	a power of probability of NA. for example power = 1/5
D	a factor constant.

Examples

# single test data: subjects=3,000 and item=30, 2PLM
set.seed(0204)
theta <- rnorm(3000)
a <- rlnorm(30, sdlog = 0.25)
b <- rnorm(30)
#sim_data_2 <- irtfun2::sim_gen(theta=theta, b=b, a=a)

# GIRT estimated parameter
set.seed(0204)
theta <- rnorm(3000)
phi <- rinvchi(3000, max = 2)
a <- rlnorm(30, sdlog = 0.25)
b <- rnorm(30)
#sim_dat_girt <- sim_gen(theta=theta, phi=phi, a=a, b=b)

takuizum/irtfun2 documentation built on May 10, 2020, 8:30 a.m.