Fix typo (#64)

Author: mvwestendorp

02-Model-Development-Process.Rmd

@@ -159,7 +159,7 @@ where $\underline{\theta}' = (\underline{\beta}', \sigma^2)$ and $\underline{I}_
 (\#eq:modelTrainingEq2)
 \end{equation}
 
-For the classcal linear regression, the penalty term $\lambda(\underline{\beta})$ is equal to $0$. In that case,  the optimal parameters $\hat{\underline{\beta}}$ and $\hat{\sigma}^2$, obtained from \@ref(eq:modelTrainingEq0), can be expressed in a closed form:\index{Penalty ! term}
+For the classical linear regression, the penalty term $\lambda(\underline{\beta})$ is equal to $0$. In that case,  the optimal parameters $\hat{\underline{\beta}}$ and $\hat{\sigma}^2$, obtained from \@ref(eq:modelTrainingEq0), can be expressed in a closed form:\index{Penalty ! term}
 
 \begin{eqnarray*}
 \hat{\underline{\beta}} &=& (\underline{X}'\underline{X})^{-1}\underline{X}'\underline{y},\\