R/tam_AXsi_fit.R

In alexanderrobitzsch/TAM: Test Analysis Modules

## File Name: tam_AXsi_fit.R
## File Version: 0.04

tam_AXsi_fit <- function(A, AXsi)
{
    dim_A <- dim(A)
    NX <- dim_A[3]
    #--- define fit function
    fit_fct <- function(x){
        sum( ( AXsi - tam_AXsi_compute(A=A, xsi=x) )^2, na.rm=TRUE)
    }
    # fit
    res0 <- stats::optim(  rep(0,NX), fit_fct, method="L-BFGS")
    #--- OUTPUT
    return(res0$par)
}