\begin{equation}
y=\frac{\hat{K}+\frac{\sigma _{\hat{K}}^{2}F\left( \hat{X},K_{\hat{X}%
}\right) }{f^{2}\left( \hat{X}\right) }}{\sqrt{\sigma _{\hat{K}}^{2}}}\left(
f^{2}\left( \hat{X}\right) \right) ^{\frac{1}{4}}  \label{cvr}
\end{equation}%
