$V\left(t\right)$

${\widehat{V}}_{MLE}$

${\widehat{V}}_{B\mathrm{.}SE}$

${\widehat{V}}_{B\mathrm{.}HT}$

$0.476465\cdot t^{-0.2946}$

$0.352321\cdot t^{-0.256018}$

$0.507238\cdot t^{-0.304011}$

$0.5062\cdot t^{-0.303533}$