calculates the BLE for Beta

1 | ```
E_beta(ys, xs, a, R, Vs)
``` |

`ys` |
response variable of the sample |

`xs` |
explicative variable of the sample |

`a` |
vector of means from Beta |

`R` |
covariance matrix of Beta |

`Vs` |
covariance of sample errors |

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