A buy signal is generated when the RSI breaks the oversold line in an upward direction, which means that it goes from below the oversold line to moving above it. A sell signal is formed when the RSI breaks the overbought line in a downward direction crossing from above the line to below the line. A more conservative approach can be used by setting the overbought and oversold levels at 80 and 20, respectively.

Another crossover technique used in formulating signals is using the centerline (50). This technique is exactly the same as using the overbought and oversold lines to formulate signals. This technique will often form signals after a movement in the direction they are predicting but are used more as a confirmation then a signal compared to the other techniques. A downward trend is confirmed when the RSI crosses from above 50 to below 50. An upward trend is confirmed when the RSI crosses above 50.

其次，可在中心線（50線）上找交叉點。其做法和用超買超賣線時一樣。這些交叉點主要是用來確認(rèn)預(yù)測的變化趨勢。RSI由上向下穿過中心線時，給出一個下跌趨勢的信號。相反則為上升趨勢信號。

Divergence can be used to form signals as well. If the RSI is moving in an upward direction and the security is moving in a downward direction it signals to technical traders that buying pressure is increasing and the downtrend may be coming to an end. Divergence can also be used to signal a reversal in an upward trend where the RSI is decreasing signaling increasing selling pressure in an upward trend.

最后，發(fā)散（譯注：指股價和RSI變化背道而馳）也可以作為信號用。RSI呈現(xiàn)上升狀而股價呈下降態(tài)時，表明買入壓力在增加，股價下降趨勢可能近期內(nèi)會結(jié)束?？梢詾橐恍┘夹g(shù)性買賣的股民提供一個信號。相反，RSI呈現(xiàn)下降狀，表明賣出壓力增加，股價上升的勢頭有轉(zhuǎn)向的可能。

The RSI is a standard component on any basic technical chart. The relative strength indicator focuses on the momentum underlying the security and is a great secondary measure to be used by traders. It is important to note that the RSI is often not used as the sole generation of buy-and-sell signals but used in conjunction with other indicators and chart patterns.