negllik_jt_rho: Computes negative log-Likelihood
In PatrickPfeifferDSc/bite: Bayesian Inference On Treatment Effects For Panel Data

Internal. Pendant to negllik_jt for the ρ parameter

1 2	negllik_jt_rho(theta, j, t, epsy, mu_xst, start_x, nx, start_y, sgmaj, rhoj)

`theta`	parameter of variance/covariance matrix of dimension 2Tmax x 1
`j`	treatment
`t`	panel time
`epsy`	residuals of y
`mu_xst`	mean vector of x*
`start_x`	Tmax x trt matrix, containing indicators for panel time - treatment combinations in data vector
`nx`	dimension of x
`start_y`	Tmax x trt matrix, containing indicators for panel time - treatment combinations in outcome vector
`sgmaj`	variance for treatment j
`rhoj`	correlation for treatment j