R/sampling_hrm_mu_1dim.R

In immer: Item Response Models for Multiple Ratings

## File Name: sampling_hrm_mu_1dim.R
## File Version: 0.10

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# sampling theta one dimension
sampling_hrm_mu_1dim <- function( theta, prior, N ){
    m1 <- mean( theta )
    m2 <- prior$mu$M
    w1 <- N / stats::var(theta)
    w2 <- 1 / prior$mu$SD^2
    m0 <- ( w1*m1 + w2*m2 ) / (w1 + w2 )
    s0 <- 1 / sqrt( w1 + w2 )
    mu_new <- stats::rnorm( 1, mean=m0, sd=s0 )
    return(mu_new)
}
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