It also has to be in context of your methodology/system. For example, I use two particular algorithms, one that gives me precalculated price points and the other that gives pretty reliable exhaustion points. The combination of the two are pretty reliable, but obviously this is not a science. Statistically, I know how many points the market can slosh around my entry level, so I know where I can add up and how much if I so choose. Call it what you want, avg'ng or MartinG. I only recommend adding up if you are quite confident in your method(s), and only you can determine that. Give me 100 successful traders and I'll virtually guarantee that every one of them does something quite different from the other, but they know their game.