混合モデル
( X ′ R − 1 X X ′ R − 1 Z Z ′ R − 1 X Z ′ R − 1 Z + G − 1 ) ( β ^ u ^ ) = ( X ′ R − 1 y Z ′ R − 1 y ) {\displaystyle {\begin{pmatrix}X'R^{-1}X&X'R^{-1}Z\\Z'R^{-1}X&Z'R^{-1}Z+G^{-1}\end{pmatrix}}{\begin{pmatrix}{\hat {\boldsymbol {\beta }}}\\{\hat {\boldsymbol {u}}}\end{pmatrix}}={\begin{pmatrix}X'R^{-1}{\boldsymbol {y}}\\Z'R^{-1}{\boldsymbol {y}}\end{pmatrix}}}