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Volatility-based Position Sizing Method with Adjustable Parameters

by clonex, 2427 days ago
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This MM script is a simple improvement version Tom Huggens "Historical trading volatility-based system to adjust trade sizes"
You can change and optimize period of stddev and moving average.

Here is Tom Huggens description:

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 for stocks, FOREX currencies, options or futures contracts.

This technique has several variations; each one has its own volatility rule that will be used to determine the size of each trade. The current script analyzes and calculates the volatility of the security you are about to buy/short and update the number of shares according to this volatility. The 10 day standard deviation is used to calculate the volatility.


Here are the different scenarios that can occur during the simulation/backtest of your trading strategy:

First, the ratio of the historical volatility to the current trading volatility is calculated.


- If this ratio is lower than one then buy or short (1 - Ratio) in percentage the amount of the initial trade size

- If this ratio is between one and two then buy or short the amount of the initial trade size multiplied by the ratio (Expressed in Percentage)

- If this ratio is higher or equal to two then buy or short two times the amount of the initial trade size

The initial trade size is calculated by taking the total current equity of your trading system and dividing it by the number of allowed positions or trades.

You can also apply two position sizing systems in backtests. This script will simply modify the size of the positions that were determined by the first position sizing method.

The script currently uses 10 days to calculate the historical trading volatility; you can of course update and optimize this value.


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Type: Advanced Money Management

Object ID: 1135


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Trading financial instruments, including foreign exchange on margin, carries a high level of risk and is not suitable for all investors. The high degree of leverage can work against you as well as for you. Before deciding to invest in financial instruments or foreign exchange you should carefully consider your investment objectives, level of experience, and risk appetite. The possibility exists that you could sustain a loss of some or all of your initial investment and therefore you should not invest money that you cannot afford to lose. You should be aware of all the risks associated with trading and seek advice from an independent financial advisor if you have any doubts.