OscatsModelL1p
OscatsModelL1p — One-Parameter Logistic (1PL) Model
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Details
struct OscatsModelL1p
struct OscatsModelL1p;
The One-Paramter Logistic (Rasch) IRT model:
P(X=1|theta) = 1/1+exp[-(sum_i theta_i -b + sum_j d_j covariate_j)],
where b is the item difficulty.
Distance is defined as: abs(sum_i theta_i - b + sum_j d_j covariate_j).
Parameter names: Diff.
References:
R. J. de Ayala
(2009).
The Theory and Practice of Item Response Theory.
p 15.
G. Rasch
(1980).
Probabilistic Models for Some Intelligence and Attainment Tests.