The most common are 9 and 14 day RSI, obvious trend lines and support levels, Fibonacci retrenchment, MACD and 9, 20 & 40 day exponential moving averages. The closer you get to what most traders are looking at, the more precise your estimations will be.

In estimating your financial trades, you must be careful with the trading software processes you are intending. The reason for this is simple arithmetic, larger numbers of buyers than sellers at a certain price will move the market up from that price and vice-versa. This will prove that marketing with estimation is probably precise when dealing with market trades.