Sum

The total of the last N values, this bar included; most useful on changes or 0/1 signals, not on prices.

Sum adds up the last N values of its input, the current bar included. On the default close it is about N times the price, so it moves like an average scaled up by N. It earns its place on inputs that change sign or count events, such as a price change or a signal, where it gives the net move or the number of events over the window.

How to read it

The line sits in its own pane, since the sum of N closes is far above the candles.
On a price change it reads as the net move over the window: above zero means up overall.
On a 0/1 signal it reads as how many bars of the window the signal was on.

What it outputs

Sum: The total of the last N values of the input, this bar included.

Settings

Window: How many bars are added up. Longer windows total more bars and change more slowly; shorter ones react to the last few bars.

Pitfalls

On prices the sum is just N times the average, so Avg reads more easily; use Sum when the input is a change or a count.