Kelly Ratio

Learn forex scalping.In one of my articles we talked about the criteria for developing a good mechanical trading system. The important question is how to develop a trading system, evaluate it and then apply it with real money. There are many factors to consider while testing and evaluating a mechanical trading system.

Understand the forex market. We need to not only know that the trading system is profitable for each trading system that we test. But we should also know whether it is profitable with limited equity swings. We should know does the trading system have excessive drawdown periods?

Three of the most important elements of mechanical trading systems are: 1) Rules for exiting at profit targets. 2) Rules for exiting at loss targets or how much loss is permissible and 3) Clear cut rules for entry and exit for each trade. Learn swing trading.

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Does the trading system experience periods of time that result in significant losses that give back those gains when a string of multiple winners and substantial profits accrue? Do losses exceed gains more than what is tolerable in the long run?

A money management tool used by system traders is the Kelly Formula or Ratio. John Kelly while working at AT&T Bell Labs had developed the formula in 1956. Most traders do not know when to correctly add on a trading position.

Gamblers realized its potential as an optimal betting system in horse racing. It soon became popular with the gamblers. This formula enabled gamblers to maximize the size of their bets on consecutive races.

Gamblers would use the Kelly Formula to determine how much to parlay winnings into the next bet. Kelly Formula is used by many traders to determine how much money to place on the next trade taking into account the historical performance of the trading system.

Kelly Ratio is given by the formula: K=W-[(1-W)/R] where K is the Kelly Ratio in percentage. W is the winning probability and it is the probability that any given trade that you make will return a positive amount. R is the Win/Loss Ratio and it is the total positive trade amounts divided by the total negative trade amount.

Kelly Ratio tells you what you should ideally be willing to risk on each trade to maximize your total returns in terms of the percent of your total account. Suppose K is 25% then you can risk 25% of your account on each trade.

To be on the safe side you should half the ratio. Suppose K is 25%. You should half it to 12.5%. What it means is that you should not risk more than 12.5% of your account on a single trade. Many traders argue that the Kelly Formula gives too high a figure so half it to be on the safe side.

Kelly Formula can help you in comparing two trading systems. You can use it in deciding which one is better in the long run. You should look for a trading system that has the highest Kelly Ratio.

Back testing is used to evaluate the historical performance of a trading system. It shows the strength and weaknesses of each trading system in the long run. You can use the back testing results in the Kelly Formula.

So back testing combined with the Kelly Formula can help you achieve in most market conditions, the highest trading profits with the lowest risks.

Kelly Ratio

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