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Explanation to Bollinger's Bands

Bollinger Bands was created by John Bollinger in the early 1980s, its purpose is to define price action relative to the assets highs and lows. This technical indicator is used to identify buy and sell signals and has proven very well in doing so.

Bollinger Bands consist of a set of three curves drawn in relation to securities prices. The middle band is a measure of the intermediate-term trend, usually a simple moving average, that serves as the base for the upper and lower bands. The interval between the upper and lower bands and the middle band is determined by volatility, typically the standard deviation of the same data that were used for the average. StockInvest.us uses Bollingers suggested 20 day average.

Middle Bollinger Band = 20-period simple moving average
Upper Bollinger Band = Middle Bollinger Band + 2 * 20-period standard deviation
Lower Bollinger Band = Middle Bollinger Band - 2 * 20-period standard deviation

BandWidth defines the current width of the band.
%b defines the current position within the band.

BandWidth = (Upper Bollinger Band - Lower Bollinger Band) / Middle Bollinger Band
%b = (Last - Lower Bollinger Band) / (Upper Bollinger Band - Lower Bollinger Band)

Live Samples:

Bollinger Bottleneck Buy Pattern 1
Bollinger Bottleneck Buy Pattern 2
Bollinger Bottleneck Sell Pattern

Bottlenecks in bandwidth indicate an upcoming change. Break up through the moving average line or continuous movements above the moving average line indicate a break up, and vice versa.

Source: http://www.bollingerbands.com

RSI low/high Values: [ 25 - 75 ]
* StockInvest.us uses dynamically calculated RSI max/min levels to determine when stock is oversold or overbought based on historical behavior.

FAQ

What is the symbol for China Telecom Corp Ltd Stock and on which exchange is it traded?
The symbol for China Telecom Corp Ltd is CHA and it is traded on the NYSE (New York Stock Exchange).

Should I buy or sell China Telecom Corp Ltd Stock?
China Telecom Corp Ltd holds several positive signals, but we still don't find these to be enough for a buy candidate. At the current level, it should be considered as a hold candidate (hold or accumulate) in this position whilst awaiting further development.

How to buy China Telecom Corp Ltd Stock?
China Telecom Corp Ltd Stock can be purchased through just about any brokerage firm, including online brokerage services.
Click here for our free guide on how to buy China Telecom Corp Ltd Stock.

What's the current price of China Telecom Corp Ltd Stock?
As of the end of day on the Dec 08, 2021, the price of an China Telecom Corp Ltd (CHA) share was $26.45.

What is the 52-week high and low for China Telecom Corp Ltd Stock?
The 52-week high for China Telecom Corp Ltd Stock is $32.98 and the 52-week low is $24.10.
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About China Telecom Corp Ltd

China Telecom  Ltd China Telecom Corporation Limited, together with its subsidiaries, provides wireline and mobile telecommunications services primarily in the People's Republic of China. It offers wireline voice services, including local wireline telephone services and long distance wireline services; CDMA mobile voice services, such as local calls, domestic and international long distance calls, intra-provincial roaming, and inter-provincial roaming and internati... CHA Profile

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