Trend indicators

Envelopes

Two lines a fixed percentage above and below a moving average, marking where prices are stretched.

用通俗的话解释

Prices tend to swing around their average and rarely stray very far from it. Envelopes draw a fence at a fixed distance, say 0.1% for a calm currency pair or 2–3% for a stock, so you can see when a move has gone unusually far.

计算方法

Take a moving average and add or subtract a fixed percentage of it.

Upper = MA × (1 + deviation ÷ 100)
Lower = MA × (1 − deviation ÷ 100)
Defaults: 14-period SMA, deviation 0.1%

如何使用

Set the percentage so that most candles stay inside the envelope on your timeframe.
In ranges, touches of the bands can mark turning points.
In trends, closes outside the band in the trend direction show strength.

得出结论

Unlike Bollinger Bands, envelopes do not widen in volatile times, so they are easier to read but adapt less.

示例

On EURUSD H1 with a 0.15% envelope, the price touches the lower band at 1.0790, about 16 pips below the average, and drifts back to the average over the next few hours.

示例中的价格仅作说明。

注意事项

The right percentage depends on the market and timeframe: adjust it rather than using the default everywhere.

一点历史

Percentage bands around a moving average are one of the oldest band techniques, used long before volatility-based bands such as Bollinger's.

仅供学习参考。没有任何指标或形态能预测未来，本页内容均不构成投资建议。