Skriv modellen for multippel lineær regresjon.
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Y=Xβ+ε\mathbf{Y}=X\boldsymbol{\beta}+\boldsymbol{\varepsilon}Y=Xβ+ε, ε∼N(0,σ2I)\boldsymbol{\varepsilon}\sim N(\mathbf{0},\sigma^2 I)ε∼N(0,σ2I). β^=(XTX)−1XTY\hat{\boldsymbol{\beta}}=(X^T X)^{-1}X^T\mathbf{Y}β^=(XTX)−1XTY.
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