Simulate multimodal IRT process data — simulate_multimodal

Generates deterministic synthetic person-item observations for staged M0-M3 development. Gaze is a non-negative count process and pupil is a neutral pupil-responsivity channel with explicit nuisance effects.

Usage

simulate_multimodal_irt(
  n_person = 120L,
  n_item = 20L,
  seed = 42L,
  latent_cor = diag(4L),
  rt_sd = 0.3,
  gaze_size = 8,
  pupil_sd = 0.2,
  pupil_luminance = -0.2,
  gaze_x_effect = 0.08,
  gaze_y_effect = -0.05,
  missing_fraction = 0
)

Arguments

n_person, n_item: Positive integers.
seed: Random seed.
latent_cor: 4x4 correlation matrix for ability, speed, gaze process, and pupil responsivity.
rt_sd: Residual log-RT SD.
gaze_size: Negative-binomial size.
pupil_sd: Residual pupil-channel SD.
pupil_luminance, gaze_x_effect, gaze_y_effect: Nuisance coefficients.
missing_fraction: Independent channel dropout fraction used for a baseline stress condition.

Value

An `eye_multimodal_simulation`.