Function that computes the observable log-likelihood of the mixed LM model with discrete random effect in the latent model (internal use).
lk_obs_mixed(th, nla, nPiv, nPi, nPsi, S, yv, r, k1, k2)vector of parameters
number of logits for the mass probability vector
number of logits for the intial probabilities
number of logits for the transition probabilities
number of logits for the conditional response probabilities
matrix of distinct response configurations
corresponding vector of frequencies
number of response variables
number of latent classes
number of latent states
log-likelihood
score vector