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You are now leaving Tableau Community Forums and being redirected to https://www.codecogs.com/eqnedit.php?latex=\begin{array}{rcl}&space;\frac{1}{2}\left({lower}_{current}+{upper}_{current}&space;\right)&space;&&space;=&space;&&space;\displaystyle\frac{1}{2}&space;\left(&space;1&space;+&space;\sum_{window}^{{current}&space;-&space;1}&space;{count}_{window}&space;+&space;\sum_{window}^{{current}}&space;{count}_{window}&space;\right)\\\\&space;&&space;=&space;&&space;\displaystyle\sum_{window}^{{current}}&space;{count}_{window}&space;-&space;\frac{1}{2}&space;\left({count}_{current}-&space;1&space;\right)&space;\end{array}