void MVTR::set_Beta(const Mat & B){ Beta_prm()->set(B); }
const Mat & MVTR::Beta()const{ return Beta_prm()->value();}
void MvReg::set_Beta(const Matrix &B) { Beta_prm()->set(B); }
const Vector & PCR::beta()const{ return Beta_prm()->value();}
const Matrix &MvReg::Beta() const { return Beta_prm()->value(); }