The law of probability in trading - trading secrets (2024)

Most traders are familiar with considering risk and reward as part of their trading system and indeed these aspects are very important, however just as important is the likelihood of a trade being successful, i.e. Probability of a successful trade given market conditions. This is the vitalthird part of a successful traders equation.

Science has proven that the mind plays funny games with us in terms of assessing probability of successful trades. Prior to placing a trade we tend to be more objective in terms of the likelihood of winning. Once committed to a trade our mind tricks us into believing that we have a better probability of winning than is in fact reality.

This can be the cause of big losing trades and losing streaks and is otherwise known as confirmation bias in trading circles.

When we believe things we assume them to be 100% true until proved otherwise. This isn’t how trading works. In trading the probability of a successful trade is normally between 40%-60%. It depends on different market conditions and timing or trades.

We can be successful with 40% of our trades and make lots of money as long as we manage them correctly.

We can take successful trades 80% of the time and still lose money if we manage our trades poorly.

In fact anyone can trade in either direction and make money 90% of the time as long as they manage their trades well. However this can be very difficult to do, especially from an emotional point of view.

We therefore need to assume that at any one point in time we have a probability of 40%-60% with any of our trades depending on the market conditions. This means that we will also be unsuccessful 40%-60% of the time.

We need to have the knowledge to assess the market and judge the probability of success of each potential trade. Is it 40%, 50% or 60%? It is never 100%.

As I have said before. We like being right. We hate being wrong. So losing on 50% of our trades will seem like failure to us as long as being “right” is what we associate with successful trades and being “wrong” is what we associate with losing trades.

Our brains are wired to tell us that if we keep getting things wrong we are “no good”. We develop limiting beliefs as a result of being “wrong”. We start thinking that we “can’t do it.”

An educated and objective belief in trading has a 40%-60% chance of turning into a successful tradable opportunity if we learn to ignore the false signals that the market presents. By successful tradable opportunity I mean one that will produce a good reward to risk.

Anyone can take a risk of many times the potential reward and be “right” 80% of the time. However they will not be profitable.

Is it more important to you to be profitable than right?

It should be.

The good news is that we can be right 100% of the time as well as being profitable. Being “right” in trading means taking trades according to our system. The system itself should take care of the probability and reward v risk aspects of trading.

Our system should also take care of our beliefs. It doesn’t matter what we are seeing on our charts. If something happens and our system says trade then we take the trade. If we are not profitable over time and we are trading our system perfectly then we need a new system!

If we see something on our charts and we think “it looks like it is going…” but it doesn’t trigger a trade based on our system then we don’t take the trade.

When we take a trade with our system then we accept that it may be a losing trade. It has a certain percentage chance of being a loser. If we lose then this doesn’t mean that we were wrong. It is just the probability of the trade. Take ten of the same trades and if we have followed our system and the system works then we will be profitable.

This is how you deal with losing trades. This is how you deal with beliefs in trading. Have a good system and stick to it.

Exercise

Here is another exercise for you to do. If you have got your trading system written down then go and get it. If you haven’t got a system written down then stop right now and write it down.

Once you have it then I want you to examine it and scrutinise it for beliefs. What beliefs are there in the system. Are they facts or are they beliefs? Could they be wrong? Are they supportive or unsupportive?

Write down what you discover.

Sometimes experienced and profitable traders never do this exercise. They create a system when they are beginners and this system is designed specifically for them based on their current experience. When they get more experienced they work the same system, based on the same beliefs that they had about themselves and about the market as they had as beginner traders. If they were to examine their system and adapt it to changing knowledge and experience they could exponentially improve their profitability.

Do you have some beliefs that you would like to change? That’s what we are going to do in the upcoming sections of this series.

If you are still looking for a trading system to take you into profitability then take our online trading course. As well as teaching you how to spot trading opportunities and read the market we will provide you with custom designed trading systems that you can use in the markets right away.

The law of probability in trading - trading secrets (2024)

FAQs

What is No 1 rule of trading? ›

Rule 1: Always Use a Trading Plan

You need a trading plan because it can assist you with making coherent trading decisions and define the boundaries of your optimal trade. A decent trading plan will assist you with avoiding making passionate decisions without giving it much thought.

Does probability work in trading? ›

When we believe things we assume them to be 100% true until proved otherwise. This isn't how trading works. In trading the probability of a successful trade is normally between 40%-60%.

What is the 3-5-7 rule in trading? ›

The 3–5–7 rule in trading is a risk management principle that suggests allocating a certain percentage of your trading capital to different trades based on their risk levels. Here's how it typically works: 3% Rule: This suggests risking no more than 3% of your trading capital on any single trade.

What is the theory of probability in trading? ›

They believe that overall their trading strategy will give them an edge, and allow them to come out ahead if they make enough trades. Probability theory is concerned with hypothetical outcomes of a process that can be repeated over and over again, forever.

What is 90% rule in trading? ›

The 90 rule in Forex is a commonly cited statistic that states that 90% of Forex traders lose 90% of their money in the first 90 days. This is a sobering statistic, but it is important to understand why it is true and how to avoid falling into the same trap.

What is the 80% rule in day trading? ›

Definition of '80% Rule'

The 80% Rule is a Market Profile concept and strategy. If the market opens (or moves outside of the value area ) and then moves back into the value area for two consecutive 30-min-bars, then the 80% rule states that there is a high probability of completely filling the value area.

Which trading strategy has highest probability of success? ›

One strategy that is quite popular among experienced options traders is known as the butterfly spread. This strategy allows a trader to enter into a trade with a high probability of profit, high-profit potential, and limited risk.

What is the formula for probability? ›

Calculating probabilities is expressed as a percent and follows the formula: Probability = Favorable cases / possible cases x 100.

Which trading strategy has highest probability? ›

High Probability Trading Setups Strategy
  • One popular approach is to look for price patterns. These patterns, such as head and shoulders, double tops, and triangles, often indicate a potential reversal or continuation of a trend. ...
  • Another part of the high probability trading strategy is to utilise indicators.
Jan 15, 2024

What is the golden rule of traders? ›

Let profits run and cut losses short Stop losses should never be moved away from the market. Be disciplined with yourself, when your stop loss level is touched, get out. If a trade is proving profitable, don't be afraid to track the market.

What is the 11am rule in the stock market? ›

​The 11 am rule suggests that if a market makes a new intraday high for the day between 11:15 am and 11:30 am EST, then it's said to be very likely that the market will end the day near its high.

What is the 11am rule? ›

It is not a hard and fast rule, but rather a guideline that has been observed by many traders over the years. The logic behind this rule is that if the market has not reversed by 11 am EST, it is less likely to experience a significant trend reversal during the remainder of the trading day.

How do you calculate the probability of winning a trade? ›

Calculate "W," the winning probability. Divide the number of trades that returned a positive amount by your total number of trades, both positive and negative. This number is better as it gets closer to one but any number above 0.50 is good.

How to increase probability in trading? ›

That means looking at the risk to reward ratio before entering a trade, making sure that you have a large enough account to take the risk, and if you don't, stand aside and wait for a trade you can take. Risk management is a trader's secret weapon, and you must use is to survive over the long haul.

What is the famous probability theorem? ›

Theorem 1: The sum of probability of happening and not happening of any given event is always unity, i.e., equals 1. Theorem 2: The probability of an impossible event is always equal to 0. Theorem 3: The sure events always have 1 as a probability. Theorem 4: The probability of any event is always between 0 to 1.

What is the rule of 2 in trading? ›

This has since been adapted by short-term equity traders as the 2 Percent Rule: NEVER RISK MORE THAN 2 PERCENT OF YOUR CAPITAL ON ANY ONE STOCK. This means that a run of 10 consecutive losses would only consume 20% of your capital. It does not mean that you need to trade 50 different stocks!

What is the 2 1 trading rule? ›

A positive reward:risk ratio such as 2:1 would dictate that your potential profit is larger than any potential loss, meaning that even if you suffer a losing trade, you only need one winning trade to make you a net profit.

What is the 3 trade rule? ›

Essentially, if you have a $5,000 account, you can only make three-day trades in any rolling five-day period. Once your account value is above $25,000, the restriction no longer applies to you. You usually don't have to worry about violating this rule by mistake because your broker will notify you.

What is the 70/20/10 rule in trading? ›

Part one of the rule said that in the next 12 months, the return you got on a stock was 70% determined by what the U.S. stock market did, 20% was determined by how the industry group did and 10% was based on how undervalued and successful the individual company was.

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