Sample subject specific random effects

1 |

`Omega` |
current covariance matrix |

`beta` |
current fixed effect coefficients vector |

`Y` |
current outcome vector (Y.I=cos(theta)*R, Y.II=sin(theta)*R) |

`X` |
design matrix model parameters (differs per person) |

`q` |
dimension Z(number of random effects) |

`Z` |
design matrix for random effects (differs per person) |

`ZtZ` |
transpose(Z)*Z |

`N` |
sample size at second level |

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