Function that computes the observable log-likelihood of the mixed LM model with discrete random effect in the latent model (internal use).

1 | ```
lk_obs_mixed(th, nla, nPiv, nPi, nPsi, S, yv, r, k1, k2)
``` |

`th` |
vector of parameters |

`nla` |
number of logits for the mass probability vector |

`nPiv` |
number of logits for the intial probabilities |

`nPi` |
number of logits for the transition probabilities |

`nPsi` |
number of logits for the conditional response probabilities |

`S` |
matrix of distinct response configurations |

`yv` |
corresponding vector of frequencies |

`r` |
number of response variables |

`k1` |
number of latent classes |

`k2` |
number of latent states |

`lk` |
log-likelihood |

`sc` |
score vector |

Francesco Bartolucci, Silvia Pandolfi - University of Perugia (IT)

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