# How do you calculate the fluctuating pressure coefficient: by N or N-1

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 March 11, 2014, 01:17 How do you calculate the fluctuating pressure coefficient: by N or N-1 #1 New Member   yu. yuxuan Join Date: Nov 2013 Posts: 21 Rep Power: 4 Just like the topic as follows ${C_p}^\prime (\theta )= \sqrt {\frac{{\sum\limits_{t}{{{\left( {{C_p}(\theta ,t) - {{\bar C}_p}(\theta )} \right)}^2}} }}{{N - 1}}}$ or ${C_p}^\prime (\theta )= \sqrt {\frac{{\sum\limits_{t}{{{\left( {{C_p}(\theta ,t) - {{\bar C}_p}(\theta )} \right)}^2}} }}{{N }}}$ Which item will you choose? Thanks

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