The tools and patterns observed by the trader can be simple price bars, price bands, break-outs, trend-lines, or complex combinations involving candlesticks, volatility, channels, etc.

The experiment results show that it is an effective method to reflect the characteristics of real estate cycle fluctuations and forecast the price trend with the K-line theory and Bollinger Bands.

The tightening of the bands is often used by traders as an early indication that overall volatility may be about to increase and that a trader may want to wait for a sharp price move.