Description Usage Arguments Value
This function computes the derivative of the log of the prior for a combined assessment, in which the 2PL model is used for the individual component of the assessment and the one-parameter RSC model is used for the group component of the assessment. A standard normal prior is used for individual ability, and for the logit of the weight of the RSC model a normal prior is used with standard deviation sigma
.
1 |
u |
the logit of the weight parameter of the RSC model. |
theta1 |
the latent trait of member 1. |
theta2 |
the latent trait of member 2. |
sigma |
prior standard deviation for logit of weight. |
3 * K
- vector of first derivatives, with K = length(u)
, ordered as rep(c(u_k, theta1_k, theta2_k), times = K)
.
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