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What is Standard Deviation?

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Standard deviation is a measure of dispersion. In finance, it is widely used as measure of volatility of an investment.
The higher the standard deviation of an asset, the more volatile the asset is.

The Standard deviation is simply the square root of the Variance. The Variance is calculated by taking the sum of the differences between the data values and the mean, squaring the result and then dividing it by the number of data points in the population. This formula applies when working with a complete population. In the case of a sample population, you should divide the result by the number of data points in the population minus one.


Objects: What is Standard Deviation?
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Ratio of stocks trading above their moving average plus one standard deviation to...
by Patrick Fonce, uploaded one month ago

This is a composite and market breadth indicator that calculates the ratio of stocks trading above the moving average of their close prices plus the 30-bar standard deviation to stocks trading below the moving average of their close prices minus the 30-bar standard deviation.

The Standard deviation is a measure of...

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Sharpe Ratio Ranking System to Lower Trading Strategies Volatility
by Patrick Fonce, uploaded several months ago

The Sharpe ratio is certainly the most popular measure of the performance of investment strategies or trading systems. It is a measure of the risk premium or excess return per unit of risk. It is calculated by subtracting the risk free from the portfolio's return and then dividing the result...
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Historical trading volatility-based system to adjust trade sizes
by Tom Huggens, uploaded several months ago

Traders have developed several position sizing techniques and systems. Here are for example the fixed bet size (493) and the fixed percentage of equity (499) scripts.

Another popular position sizing system, often using in trading, is the one that uses volatility to adjust the number of shares to buy or short...

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Dynamic Zones RSI - Technical Indicator
by Patrick Fonce, uploaded several months ago

In technical analysis and active trading, the majority of oscillator systems follow almost the same logic. Buy when the oscillator moves above a certain threshold and sell when it moves below a certain threshold. The problem with this approach is that it doesn't take the evolution and the volatility of...
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Fisher Transform - Technical Indicator
by bug man, uploaded several months ago

In the November 2002 issue of the Stocks and Commodities magazine, John Ehlers wrote an article "Using the Fisher Transform" and introduced a technical analysis indicator called the Fisher Transform or Fish.
The fisher transform is used to identify price reversals and is based on the assumption that prices behave like...

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Earnings: EPS Estimates
by Patrick Fonce, uploaded several months ago

The Earnings per share or EPS estimates is another object that gets fundamental data/ratios for US stocks (US listed companies).
It gets 15 items for several quarters and fiscal years. The data is stored in the "EPS_Estimates" database and it contains the following fields:

Q0 Consensus Estimate: Based on several analysts that...

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Earnings: EPS Growth
by Patrick Fonce, uploaded several months ago

This EPS Growth object downloads fundamental ratios that are related to EPS or Earnings Per Share growth.
It downloads seven EPS ratios:

Five Year Historical EPS Growth: The first item is the average annualized EPS growth over the last 5 years.
...

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Trade-Ideas Intraday Screener
by Brian Brown, uploaded several months ago

Trade-Ideas allows you to perform intraday scans using several criteria; these criteria include volatility, Average True Range, 15 minute range, 30 minute range, gap up, gap down, 15 minute RSI, range contraction, up from the close, up previous day, standard deviation, below high, above low, position in range, consolidation, market...
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Relative Volatility Index
by bug man, uploaded several months ago

The majority of technical trading indicators use the rate of change of security prices in their calculation. The Relative Volatility Indicator or RVI, uses a different time-series, it uses the volatility trend, which is calculated using the standard deviation of the security close price, to measure and evaluate market strength.

The...

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Dynamic Momentum Index
by Brian Brown, uploaded several months ago

The Dynamic Momentum Index or DMI is a technical analysis indicator used to determine overbought and oversold conditions of a particular security. Unlike other overbought/oversold indicators like the Relative Strength Index (RSI), the Dynamic Momentum Index does not use a fixed time period. Instead, the time period, used by this...
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