The McClellan Summation Index is this formula on the $ADD chart.

**Formula:**

Summation Index = 1000 + (10%Trend – 5%Trend) – ((10 x 10%Trend) + (20 x 5%Trend))

where:**
5%Trend** = 39-day EMA of (Advancers-Decliners)

**10%Trend**= 19-day EMA of (Advancers-Decliners)

The symbol for the Advancers-Decliners is delayed but is available through IB as $ADD.

The formula is implemented with this DYO, and available on the Ensign web site using the Ensign 10 Package feature to download it.

A – Create the 39 period average.

B – Create the 19 period average.

C – Calculate the first half of the formula: 1000 + (10%Trend – 5%Trend)

D – Calculate the 2nd half of the formula: 10 * 10%Trend + 20 * 5%Trend

E – Subtract the two halves. Plot this result which is the Summation Index.