29/04/09

What is a good enough edge?

For those building a system I can only commend you for taking on such a challenging and potentially rewarding task. It must be said that it is not for everyone as the skills and focus required for developing an edge are somewhat specialised and niche. The 4000 plus hours I invested into SPA3 has taught me this and I have a Maths and Computer Science background which made the task somewhat more achievable. Furthermore, this is what I do and hence have time, focus and resources around me to enable the completion and ongoing maintenance of an edge. I say this as the majority of people who make a decision to develop a system never actually complete it and hence never really get to trade it.

For those interested in buying an edge the equation below may seem less important. But you should have the knowledge to be able to assess any business in the financial services space that may provide advice to you (newsletter, broker, tipster, investment manager,systems provider etc) by asking the question “what is your edge”?

They should be able to prove to you that they have x amount of winners and y amount of losers and that the winning trades are z larger than the losing trades, over a large sample of trades, regardless of what analysis approach they use. At the very least, if a company cannot do this then you should seriously consider not investing money in their strategy or approach. There are other metrics that should be sought but we’ll leave that for another time.

Now that you have a better appreciation from past postings that an edge is needed, the next step is to understand exactly when an edge is good enough to trade profitably and also when there is no edge (i.e. a losing approach).

The first thing we need to know is at what point an edge becomes positive i.e. the minimum threshold.

This break-even point is a Mathematical Expectation (ME) of 0. Outcomes less than 0 lose money and greater than 0 make money.

Let’s use a coin toss example to illustrate what we mean by a break-even edge. If, for whatever reason, over a large sample of coin tosses, we only win 20% of the tosses we would need to win $4, on average, with our winning tosses if we lost $1, on average, for every losing toss, just to breakeven. Mathematically:

We call the 20% in the above example the Win Rate. We call the average dollar win divided by the average dollar loss the Profit Ratio, i.e. 4/1 = 4 is the Profit Ratio.

Using this formula, the Profit Ratio required to achieve a breakeven threshold for a given Winning Rate can be calculated as follows:

where WR = Winning Rate and PR = Profit Ratio.

In the above example where the Win Rate is 20% the Profit Ratio to breakeven, as we now know, would need to be:

For example, if 34% of closed trades are winners, what Profit Ratio is required to reach breakeven?

This means that the 34% of winning trades would, on average, need to be 1.94 x larger than the losing trades, after trading costs, to break even. A Profit Ratio greater than 1.94 would mean, over time, that your closed trades would be showing a net profit.

So depending how often a trading approach wins, the Profit Ratio defines how much bigger the net profit for winning trades, on average, must be than the net loss for losing trades, on average, so that you breakeven or better.

Any edge that is better than breakeven will make money over time provided that sensible money management is used. For example, if all capital is placed on single trades this could lead to disaster over a small sample of trades.

The Breakeven Table below shows, for a given Win Rate, how much a winning trade, on average, needs to return for an average loss of 1 unit.

As you can see from this table it is possible to make money with an edge that has 84% losses provided the profits are on average more than 5.25 times the size of the losses. Just about all of us would, of course, find it extremely challenging to trade such an edge.

Those that prefer a diagram, the one below shows a solid black line that depicts a breakeven edge. Note that the final edge that you trade should include brokerage, commissions and slippage.


The leftmost dot (also the uppermost one) on the breakeven line is positioned at a winning rate of 20%. A profit ratio of four will be required to break even, net of brokerage and slippage. The rightmost dot on the breakeven line is positioned at 50% where a Profit Ratio of one will be required to break even, net of brokerage and slippage.

The green dot positioned on the “Good System” line is SPA3.

Any system with an edge that falls below the breakeven line has a negative mathematical expectation and hence virtually no probability of being profitable over a large sample of trades. Through luck, over a small sample of trades you may make money, but the more trades you complete with a negative mathematical expectation system, the higher the probability that you will lose money. Absolutely no type of money management rules can save such a system over a large sample of trades.

Any system positioned above the breakeven line can make money. The further away from that line, the higher the probability that not only will it make money but also that it will be profitable from a smaller sample of trades. Also, the further away from the breakeven line, the less volatile the system’s equity curve should be and the steeper the equity curve should be. This means lower drawdowns while making money faster.

A good system does not need to be that far away from the breakeven line to make good money as the power of compounding is on your side when you have a positive mathematical expectation working for you in the market. I use the word ‘can’ rather than ‘will’ because poor money management rules will undo an edge with a high positive mathematical expectation as will poor trading psychology.

In reality, generating a system that is at or further away than the ‘Excellent System’ line will be difficult to achieve. If you do, there may be a high probability that the system is either overly optimised and hence curve fitted to a narrow price action dataset, or has too many criteria and filters which means the same thing. It is overly optimized by constraining its degrees of freedom. This may also occur with a system that trades infrequently, i.e. the historical testing generated a small sample of trades. Again, this usually results from too many criteria and over optimising.

There are many other metrics that could be established to compare one edge to the next that we won’t go into here and now.

There are a few terms that are not defined above that we can leave for another day but in the meanwhile it is important to understand the need for an edge, what an edge is, where the breakeven line is and where your system is relative to it, over a large sample of researched or live-traded trades.

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21/04/09

Defining an ‘edge’

A trading edge is a set of entry and exit criteria that, when executed, will deliver profit trades that are sufficiently large enough to cover your trading costs and loss trades, and deliver you a positive return on your capital and time. The biggest strength of deploying an edge in the market is not the edge itself, it is the processes that define executing the edge. These processes will keep you engaged in the game. Focus on your processes and the outcomes will take care of themselves. Change your focus to the outcomes and your processes will break down which will lead to worse outcomes than you otherwise would have had. Breakdown of process leads you off on dead-end tangents and trial and error on the fly. This should be done during the preparation (research) phase, not during execution.

Most technical analysts are on a quest to find the ‘best’ edge. Just as a carpenter sees all things in terms of a hammer and nails, an analyst’s paradigm is that of analysing technical entries and exits. Most analysts spend so much time searching for the ‘perfect’ entry technique that they never actually get around to trading. They are wonderful at telling you what they would have or should have done, but unfortunately this is usually with the clear vision offered by hindsight!

The trader’s paradigm is that of executing trades according to their edge. The trader’s aim is NOT to find the BEST edge – it is to discover an edge that is positive and outperforms their chosen market / benchmark over the long term. They then deploy this edge to allow them to confidently engage the markets by risking capital to make profits – a trader trades, an analyst analyses. Analysis is just one of the techniques required to be a trader, it is a small part of the overall trading formula. Profitable traders realise that consistently applying their trading ‘edge’ to the markets with trust and confidence and employing strict money management and risk management rules is the key to long term success. At the end of the day, trading is a doing word – to make money we have to trade. We don’t make profit trades sitting on the sidelines trying to discover the perfect entry system. We make money by taking trades – cutting the losers and maximising the profit potential of the winners, in your chosen timeframe for trading.

The BEST edge will NEVER be found. Take my word for it because the BEST edge is perfection, 100% winners, which does not and never will exist in any game, let alone trading, (unless you do 1 trade, win and never trade again – but this defeats the object of risking capital to make profits unless you bet the house and ….. tempting!?). There will always be a better edge than the one you are using, either existing and in use somewhere on the planet or yet to be discovered. You will always be further ahead in the long haul by engaging the game according to a set of researched rules than being out of the game searching for the ‘best edge’ or being a spectator.

The fact is that well below perfection is OK to make money, and lots of it. Simple arithmetic proves this to us. Execution of that arithmetic has proved this to me personally and many of our customers over many years now. It is the understanding of what it means not to have to be right and hence what an edge is. An edge is probabilistic, by definition. Having 41.18% winners where the average winner is 2.68 x larger than the average loser net of brokerage and slippage, doing 6.85 trades a month over 6.06 years has delivered an annual compounded return of 24.2% compared to the ALL-ORDS of 10.2% and to the ALL-ORDS Accumulation Index of 14.4% over the same period. This information is updated regularly on our website at http://www.sharefinder.com.au/SPA3%20performance.php.

Opportunity cost through being a spectator from waiting to find a better edge or fearing using an existing proven edge will invariably be larger than the profit from the compounding of profits offered by time spent in the market using a proven edge. Lost opportunity leads to feelings of anger and frustration and causes silly mistakes to be made by those trying to make up for lost opportunity. The spectator will always be behind on the learning curve compared to the player. However, “look before you leap.”

My message is: find, through your own research & development and/or otherwise, a credible proven edge, engage the game and get on with honing the remaining execution skills required to be consistently successful before time has passed you by and you have missed the opportunity of achieving compounding profits.

58 comments »

17/04/09

Trust your Edge

Traders employing a discretionary or subjective bias to their decision making can suffer enormous swings in their emotions – from euphoria when they get a winning trade, to dread and horror when they lose. Anyone hoping to achieve longevity and long term success in the markets can not trade in this way. It is simply not sustainable over the long term, because there is no plan in which to trust.

The dictionary defines trust as “reliance on the integrity, strength, ability, surety, etc., of a person or thing; confidence”. Many actions we trust inherently because the results are well within the emotional bounds between life and death. Take every day driving of a motor car. Every time that we drive a car there is a chance that we could get killed in an accident. There is nearly one motor car fatality every day, on average, in each state in Australia. However we don’t get behind the steering wheel and fear our impending journey. Why not? Two reasons. Firstly, we trust our driving skill and, secondly, we inherently know and trust that the probability of a fatality is extremely low. That is, we trust in the probabilities of getting to our destination alive. The roads are a probabilistic environment.

Other actions, including execution in the market, require that trust is earned, both in our own skill and in the probabilities that exist in executing in the market. The market is a probabilistic environment.

Much of the trust for executing in the market will come from having a well developed and researched process that you know produces a positive outcome over the long term across a wide range of market conditions. The research and development is your preparation as discussed in last week’s blog. The output is a trading system that is part of a trading plan that defines the process. The trading system must have an edge. The edge is defined in terms of probabilities and it is these very probabilities in which you trust. There is no certainty in any trade yet there is certainty over a large sample of trades because the probabilities of the edge will be met.

To find a trading system that has an edge you must make a decision; you either spend considerable time gaining the knowledge and conducting the research to build an edge, or seek out an existing and proven edge to buy. Build or buy?

Most people who choose to build never complete their edge, or at least to the point that they trust it, and hence never get to the point of executing with a predefined edge in the market. Building is only suitable for a very small percentage of investors who have the necessary skills, time and mindset. It is tough work building an edge but for those who do, it is very rewarding.

Buying an edge involves a leap of faith. To take that leap of faith there is some fundamental information that should be sort. You need to assess the builder’s qualifications, experience and ethics, and ensure their researched edge is transparent and works. The ultimate proof is the equity curve over the long term through multiple market ups and downs. It is not the result of each trade that matters, or even a few months trading – it is the overall result of the edge over multiple market conditions over a large sample of trades, including brokerage and slippage. This level of proof goes well beyond the much maligned black box systems that are regularly sold to the unwary. Trust is “reliance on the integrity and qualities / attributes” of the edge.

By choosing to buy an edge, your time can now be spent developing other areas that build trust and allow you to execute with confidence. This includes developing your trading plan, learning the processes of your trading system, improving execution and developing your trading mindset. By sticking to the rules of the trading plan, you are able to execute the trades as and when they come along with no emotional attachment to the outcome of each trade. That’s trust!

Trading is an endurance activity not a sprint. In order to survive over the long term we must have a process and set of rules we can trust. It is the probabilities of the system over the long term that we need to understand and trust.

My friend the bike rider who featured in last week’s blog, trusts his bike 100%. He prepared first and trust followed. He chose to employ, buy, a mechanic with the desired qualifications and proven experience to build a bike he can trust. As a result, my friend is able to focus on the planning and execution, pushing himself to the limits of endurance because he has the confidence to do so. This trust gives him an edge over other riders who may not have developed the same level of trust with their bike, and even with their own mind and body. Those that lack this level of trust and thus confidence, are not able to perform as well under pressure or after more than 20 hours of gruelling physical and mental endurance.

Preparation….. trust…….confidence…….execution.

Trading the markets is the same. We need to have trust – in the edge of our system, the development and workings of the system, and most importantly, ourselves. There is no other high probability way of doing it. Preparation will develop trust which will develop confidence which will overcome the emotional turmoil of fear, uncertainty, doubt and trepidation that the markets would otherwise deliver.

I have learnt that you cannot trust and fear (or worry) at the same time. So which of the two will it be for you when it comes to the market?

6 comments »

08/04/09

Preparation

In all our endeavours in life, preparation before hand is vitally important. This applies to business, sport, trading and everything else that we do in both our personal and business lives. Those that take the necessary steps to learn and prepare themselves prior to an event generally have not only a much higher chance of success, but tend to enjoy themselves more. This is because they have prepared themselves for not only the best case, but also the worst case scenario’s, and can work through these when they arise. A friend of mine recently competed in a 24 hour mountain bike race – a true endurance test of both body and mind. For us, that seems like an incredibly weird thing to do, riding a bike from lunch time Saturday, through the night, and finishing at lunch time on Sunday. Lacking sleep, fighting the demons of fatigue and exhaustion, and pushing both body and mind to the outer limits of their endurance capabilities.

But, my friend loves it and can undertake these events because he is prepared for them. Not only through physically training, but also through mental preparation. Thinking through the range of probabilities that can occur and having a plan in place to deal with them when and if they arise. From the simple things like carrying a rain jacket in case it rains, to recognising the symptoms of fatigue and what to do firstly to prevent it, and secondly how to deal with it at 3.30am in the morning when it’s 3 degree’s and your mind is screaming at you to ride back to the tent and have a sleep.

To achieve this feat, he has processes in place. He has a training regime that builds slowly, adding extra distance each week to the length of each training ride. He then slowly adds in some night riding practice, again increasing this each week. He has a strict dietary program, and is meticulous with monitoring calorie and protein intake. He has performance measures – testing himself against others, as well as against his own parameters. He monitors himself for fatigue and is careful to rest when he needs to. And, he is careful not to crash and suffer serious injury, as that would spoil all the fun. In short, he prepares himself well in advance of each event and knows what to do, when to do it, and how to do it. He is also a trader, and reckons the two are pretty similar.

Traders need to be prepared. They need to have processes in place to enhance this preparation. Knowing and understanding the range of probabilities of your system is preparation. Knowing and accepting that it will have winning trades, losing trades, drawdowns, make new equity highs and have winning and losing streaks is preparation. This knowledge provides you with a full understanding of the system and how it will perform.

Having a disciplined process is preparation. A daily routine for running scans, entering and exiting trades as required, monitoring open positions, and recording all the results and ‘numbers’ of the trades is preparation.

Monitoring the performance of the system against others, or against a personal benchmark is preparation. By comparing this information you can monitor where you are ‘at’ when compared to other traders, against industry averages, and against the goals you have set to achieve.

Staying fit and healthy is preparation. You can’t perform at your optimum level or make balanced decisions if you are tired and rundown. Trading requires us to remain alert and disciplined in all that we do. This is difficult if we are feeling unhealthy or ill. Adequate rest and relaxation is very important.

Having exit strategies in place is preparation. Crashing out of the game is not an option. You can’t win it if you’re not in it. If you burn through your capital as a result of a series of large losing trades, or through having no money management or risk management procedures in place, you can’t participate in the winning trades when they come along.

Analogies are often drawn between sport and trading. The key to success in both is preparation of knowledge, processes and monitoring. By preparing ourselves mentally and physically for what the markets throw at us, we can, like my bike riding friend, endure the tough times and make it through to experience the good times.

Happy Easter

1 comment »

01/04/09

Matter of Confidence

Following on from last weeks blog on executing good trades, this week I will look at the issue of confidence from a trading perspective.

The dictionary definition of confidence is ‘a feeling of reliance or certainty’. Here’s another positive way to define it:- Confidence is thinking about, and concentrating on what you want to happen. Lack of confidence is thinking about, and concentrating on what you don’t want to happen. If you think about what you don’t want to happen in the trading arena there is a high probability that you won’t do the action that might produce what you don’t want to happen. Sounds a bit double dutch but this simply means that without confidence you don’t execute thereby also eliminating the possibility of a positive outcome. Or you execute poorly. As trading is about constantly probing for opportunities to achieve positive outcomes, traders require confidence in their system and themselves to enable them to continually execute trades.

Confidence is a feeling and that feeling is determined by what you think. Notice, too, that confidence is defined as a feeling of certainty. This does not mean that the outcome that you feel confident about is certain, just that you feel certain about it. If you don’t feel certain, i.e. confident, then it is likely that you won’t execute the action, either at all, or as you intended. Why would anybody actually do an action where they feel they will lose compared to another action where they feel they will win? What I have learned is that the quality of our execution is based on the degree of confidence that we have nourished in our conscious and subconscious minds.

However, no outcome can be certain because there are simply too many variables at play in the universe that are beyond our control. These can affect the future outcome of any event, especially in the financial markets. It is important to accept this as a trader (or any other role in life) otherwise we may set an expectation into the future that we know (either through feeling certainty or some other basis) what will happen next and this expectation will attach us to the outcome. When we become attached to the outcome we put significance and meaning on the outcome and hence we set ourselves up for disappointment when the outcome is not what we expected. When we experience disappointment on an ongoing basis we become disillusioned about what we are doing and we spiral into programming ourselves to having a losing state of mind. As a result we lose confidence.

This happens with the majority of traders, especially short-term and medium-term traders. How many times have you not executed trades that soar and you have found yourself saying: “I knew that I should have done that trade!” What actually transpired was that you weren’t confident about the trade (for whatever reason) so you didn’t execute or executed poorly by entering too late. The negative thoughts that popped into your head are a part of who you are and are an indication of your degree of trading confidence.

So how do we learn to feel certain about outcomes that we know are uncertain? This is a paradox. The market, like life, is full of paradoxes and uncertainty. As traders (or golfers or most other things in life) we need to learn to think about what we want to happen and block out the thoughts of what we don’t want to happen.

The things that we don’t want to happen, like losing trades, will still happen due to randomness or the limitless number of variables out of our control that interact in the market. But we can learn to detach ourselves from the outcome of trades. Doing so will overcome emotionally charging our reaction to outcomes, losing or winning outcomes. We can do this if we have confidence in the edge of the trading system we are using and by having a trading plan. Confidence in the edge of the system can be gained by understanding the probabilities generated by the system over time. If over a large sample of trades the system generates a profit and has a positive trade expectation, then this is what we must focus on. Being able to do this will generate confidence to continually execute signals to buy and sell, knowing that some trades will win, and some will lose but the edge is in our favour over a large sample.

To nourish confidence you must have faith and trust. But how is trust developed? Defining a trading process that you believe in and learning to both trust it and believe in it will be the topic of further discussion in this blog.

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