Volume Spread Analysis VSA
If the VSA indicator painted a green bar, it means that the market saw a large volume during the flat, in other words – the appropriate candle had low spread. This is one of the most complex patterns in every sense of the word, since, firstly, false signals are not uncommon on the history, and secondly, a similar phenomenon may be due not to the activities of major market operators, but due to the usual "news chaos".
Bars of yellow color are characteristic of the candles with a small volume and low spread, they usually appear during the "night flat" (a period of low trading activity), but if a similar pattern emerged during the operation of the major sites, it could signal the end of the trend (even the crowd lost interest in the movement).
The final pattern that the VSA indicator identifies is presented as a purple bar on the volume histogram. The argues that this signal appears on a series of candles with a large volume, but experience has shown that this phenomenon is so rare that it can be ignored.
The gray bars are neutral we do not take them into account.