# Aug 7: How To Analyze Trading Systems – Part 14

The astute system tester may have realized that a slight change in trading systems variables can have dramatic effects on its profitability. But, is profitability the only criteria by which you should be evaluating trading systems?

Clearly, the answer is NO!

Here are just a few other criteria you need to look at:

– Are you satisfied that your trading systems are reliably profitable?

– Will your trading systems drawdown wipe out your account?

– Are your trading systems trading in a way you can tolerate?

– Can you tolerate long periods of your trading systems not trading or too much trading?

– Can you tolerate a trading systems with a large string of losses?

To answer these, and other similar questions, you must analyze the results of your trading systems from your back testing. Unfortunately, with the excess of trading statistics that most back testing programs provide, this can be easier said than done. I believe you really only need to pay attention to a few critical statistics. Here are the ones I pay close attention to:

Win/Loss Ratio

When you assess the performance of trading systems, one of the first statistics that gives you a good indication of the strength of these trading systems is the Win/Loss ratio. Quite simply, this is the ratio of the average winning trade in dollar terms, against the average losing trade in dollar terms.

If this ratio indicates you are, on average, winning more than you are losing, you are on the right track. However, realize that this statistic on its own isn`t enough because it doesn`t consult how much was risked to produce that gain or loss.

Risk Multiple

The risk multiple (R-Multiple) builds upon the win/loss ratio in that this is the win/loss ratio compared to the amount of money risked to make that win/loss.

It`s a measure of the reward obtained from the trade compared to the amount of risk taken for the trade.

For example, if you risk $100 and make a profit of $500, then you have made 5 times the amount you risked in the trade, in which case, you have an R-mulitple of 5. This means that for every $1 you risked you were rewarded with $5.

Similar to the win/loss ratio, this statistic on its own isn`t enough to determine whether your trading systems are worth trading.

Expectancy

The trading systems expectancy is perhaps one of the most powerful statistics you can have because it is a way of quantifying the performance of your trading systems that are independent of the size of the trading float.

Simply it answers the question how much money can my trading systems, on average make for every dollar that I risk?

In short, it returns the expected dollar return for each dollar risked by your trading systems. This is different to the reward risk ratio which we described above, that was a specific ratio of reward to risk. Expectancy defines a return in dollar terms for every dollar that you risk.

For example, trading systems with positive expectancy are ones in which a positive dollar return is expected for each dollar risked. If your trading systems have an expectancy of +0.75, on average you would expect to make .075 times the amount you risked in the trade. If you risk $1, then you would expect to make on average $0.75 for every trade you take.

As a guide, if you can achieve expectancy of $0.60, you have a good profitable trading system.

Number of Trades

Then there`s, the number of trades a system gives over the course of a year. I find this an invaluable, yet rarely talked about, statistic.

Your trading system should not give too many or too few trades. The number of trades that a trading system gives should be approximately the same as what can realistically be taken.

The two sides of the coin are equally dangerous. If a system gives too many trades, you will be forced to choose between signals, therefore adding ambiguity to the system. With ambiguity comes human discretion and this often has a detrimental effect on the performance of the trading system.

On the other hand, if a system gives too few trades, your trading capital will not be fully utilized and you may not be taking full advantage of the available trading opportunities.

So how do you calculate the optimal number of trades for a trading system? I`m glad you asked ?

This is done with the calculation called “opportunity.” In short, opportunity helps determine your optimal opportunity for a trading system.

Opportunity = (240 / Average Days In Trade) * (Trading Float / Average Trade Size)

For example the optimal opportunity for a trading system with the following variables would be:

Float = $25,000

Average Days In Trade = 19

Average Trade Size = $3,500

Opportunity = (240 / 19) * (20,000/3,500) = 72 trades per year.

Annual Profitability Return

Lastly, with the statistics we`ve now covered, we can calculate the annual profitability return of your trading system. The profitability of a trading system is the combination of the expectancy and opportunity.

Now, it`s simply a matter of plugging in the values you have already calculated into the formula below:

Annual Profitability Return = Expectancy * Opportunity * Percentage Risk Per Trade1.

1. Percentage Risk Per Trade Defined In Trading Secrets Revealed

For example, if a system with an expectancy of .75 had an opportunity of 72 trades per year and we risked a maximum of 2% per trade, the annual profitability return would be calculated as follows:

Annual Profitability Return = .60 * 72 *2% = 86.4% p.a.

Can you see the power within these statistics? Statistics really is a topic worthy of a complete course itself. They really do provide tremendous insight into a trading system.

If you found this topic interesting and would like to further expand your understanding of this topic. You may be interested in looking further into Dr. Van Tharps work. In fact, he has a fantastic course that covers these topics, and many others, critical to the understanding of system design.

Tharp`s course is called Developing a Winning Trading/Investing System That Fits You, and I have found it invaluable. Although it`s not critical, you can purchase your copy online by clicking here

–> http://www.meta-formula.com/van-tharp

Let`s make you a market wizard.

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MUST DO ACTION STEPS:

Click below to purchase a copy of Van Tharp`s “Developing a Winning Investing / Trading Systems– That Fit You.” Your goal from this program is to understand how to evaluate a trading system using statistics.

–> http://www.meta-formula.com/van-tharp

Remember to keep any eye out for my next email because you will learn how to select the PERFECT BROKER.

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You`ve Read Part 14 of The Ultimate Trading Systems Series –

The Formula For Designing Profitable Trading Systems.

To Download This Entire Series For FREE Click Here.

Click Here ==> http://www.ultimate-trading-systems.com/greatnews.htm

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