Sandbox

$PCONGREAT=\sqrt{\frac{SumSharesSq-\frac{1}{SumGreat}}{1-\frac{1}{SumGreat}}}$

where

$SumSharesSq={\sum }^{GPowers}(\frac{POWE{R}_{\gamma }}{{\sum }^{GPOWERS}POWE{R}_{\gamma }}{)}^2$

<math>SumGreat=NumberofGreatPowers