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The definition and meaning of the Fisher Information is a rather subtle but powerful mathematical concept. It should be thought of as a way to statistically measure a parameter. Based on our definition this information is again motivated as a type of variance, however it measures the fluctuations in the survival function itself. The Fisher information was proposed by Fisher as follows.  \begin{equation}  I(t)=\sum_i\gamma_i\left(\frac{d}{dt}[\ln\gamma_i]\right)^2 I(t)=\sum_i\gamma_i\left(\frac{d}{dt}\ln\gamma_i\right)^2  \end{equation}  \subsection{Inequality}