Every trader has a system. Not every trader knows it.
To do well in the markets, you need to know your system. Knowing your system encompasses a number of elements. The first to note is the your part of the sentence. The system you use should be your system. That doesn't mean you have to come up with every idea and every element on your own - on the contrary, there are many smart folks out there that can give you some good ideas.
Making a system your own means that you have an answer for every element in the system, and you have tested the system to an extent that you have a reasonable understanding of it's performance in different markets.
The following elements are needed in order to have a complete system. Note that the more specific each of the criteria, the better your system. Specificity will be key in tuning your system over the long term.
Personality
To get started in creating your own system, I believe that a very important first step is to understand your own personality in a trading scenario. We'll touch on the subject of trading psychology more in future posts, but for today let's keep it simple by asking ourselves two simple questions: First, what time frame would I like to trade? Second, what is my appetite for volatility? The answers to these two questions will help you to filter various systems down to those that you can trade. The most perfect system in the world is no good if you can't stick to it!
Money Management
Some call this rick management or position sizing. All it really means is that you have a system in place to prevent losses and manage risk. One example would be that you never risk more than 2% of your current portfolio value on any one trade.
Filters
Filters are used to narrow the trading universe down to a starting list to examine for setup conditions. For example, you may with to trade stocks between $10 and $50 only, thus reducing the universe of stocks from over 7000 down to around 3000. Other filters such as fundamental indicators, EPS, earnings growth, etc. should all be defined in very specific conditional terms.
Setup
A setup is a condition that makes a stock say "Hey! Look at me!". The best setups can be programmed so that you can automate the scanning of the market for new issues that meet your setup conditions. Example: Today's high is the highest high of the last 80 days.
Entry
This element alone is often viewed as a system unto itself. Bill O'Neil of CANSLIM and Investors Business Daily fame has a number of excellent entry indicators in his popular book How to Make Money In Stocks. The entry condition will tell you when it is OK to go ahead and watch that stock you've had your eye on in the Setup list.
Exit
The single most important and the single most overlooked element of a system. If you don't have an exit component, then it's not a system! This will be one of the least discussed and hardest elements to design, but don't despair - many others have come before you and successfully designed their own systems. If worse comes to worse, just pick something simple such as "if the issue moves against me for three days in a row". As you begin testing your system you will refine your exits, so don't worry about getting it perfect.
Optional Elements
As you progress through testing your system, you may wish to add additional elements such as portfolio balancing, equity curve analysis, market exposure rules, etc. For now, focus on the basic system and understanding how it behaves in the markets.
In the next post we'll explore how to get to know your system's personality.
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