Today's market analysis platforms allow traders to quickly review a trading system's performance and evaluate its efficiency and potential profitability. These performance metrics are typically displayed in a strategy performance report, a compilation of data based on different mathematical aspects of a system's performance. Whether looking at hypothetical results or actual trading data, there are hundreds of performance metrics that can be used to evaluate a trading system.
Traders often develop a preference for the metrics that are most useful to their trading style. While traders may naturally gravitate towards one number  total net profit, for example  it is important to understand and review many of the performance metrics before making any decisions regarding the potential profitability of the system. Knowing what to look for in a strategy performance report can help traders objectively analyze a system's strengths and weaknesses. (For a background, see our Trading Systems Tutorial.)
Strategy Performance Reports
A strategy performance report is an objective evaluation of a system's performance. A set of trading rules can be applied to historical data to determine how it would have performed during the specified period. This is called backtesting and is a valuable tool for traders wishing to test a trading system before putting it in the market. Most market analysis platforms allow traders to create a strategy performance report during backtesting. Traders can also create strategy performance reports for actual trading results.
Figure 1 shows an example of a performance summary from a strategy performance report that includes a variety of performance metrics. The metrics are listed on the left side of the report; the corresponding calculations are found on the right side, separated into columns by all trades, long trades and short trades.
Figure 1  The "front page" of a strategy performance report is the performance summary. The key metrics identified in this article appear underlined. 
In addition to the performance summary seen in Figure 1, strategy performance reports may also include trade lists, periodical returns and performance graphs. The trade list provides an account of each trade that was taken, including information such as the type of trade (long or short), the date and time, price, net profit, cumulative profit and percent profit. The trade list allows traders to see exactly what happened during each trade.
Viewing the periodical returns for a system allows traders to see performance broken down into daily, weekly, monthly or annual segments. This section is helpful in determining profits or losses for a specific time period. Traders can quickly assess how a system is performing on a daily, weekly, monthly or annual basis. It is important to remember that in trading, it is the cumulative profits (or losses) that matter. Looking at one trading day or one trading week is not as significant as looking at the monthly and yearly data.
One of the quickest methods of analyzing strategy performance report is the performance graph. This shows the trade data in a variety of ways; from a bar graph showing monthly net profit, to an equity curve. Either way, the performance graph provides a visual representation of all the trades in the period, allowing traders to quickly ascertain whether or not a system is performing up to standards. Figure 2 shows two performance graphs: one as a bar chart of monthly net profit; the other as an equity curve. (To learn more, check out Charting Your Way To Better Returns.)
Figure 2  Each performance graphs represents the same trade data shown in different formats. 
Key Metrics
A strategy performance report may contain a tremendous amount of information regarding a trading system's performance. While all of the statistics are important, it's helpful to narrow the initial scope to five key performance metrics:
 Total Net Profit
 Profit Factor
 Percent Profitable
 Average Trade Net Profit
 Maximum drawdown
These five metrics provide a good starting point for testing a potential trading system or evaluating a live trading system.
Total Net Profit
The total net profit represents the bottom line for a trading system over a specified period of time. This metric is calculated by subtracting the gross loss of all losing trades (including commissions) from the gross profit of all winning trades. In Figure 1, total net profit is calculated as:
While many traders use total net profit as the primary means to measure trading performance, the metric alone can be deceptive. By itself, this metric cannot determine if a trading system is performing efficiently, nor can it normalize the results of a trading system based on the amount of risk that is sustained. While certainly a valuable metric, total net profit should be viewed in concert with other performance metrics. (For more, see Profiting In A PostRecession Economy.)
Profit Factor
The profit factor is defined as the gross profit divided by the gross loss (including commissions) for the entire trading period. This performance metric relates the amount of profit per unit of risk, with values greater than one indicating a profitable system. As an example, the strategy performance report shown in Figure 1 indicates the tested trading system has a profit factor of 1.98. This is calculated by dividing the gross profit by the gross loss:
$149,020 / $75,215 = 1.98 
This is a reasonable profit factor and signifies that this particular system produces a profit. We all know that not every trade will be a winner and that we will have to sustain losses. The profit factor metric helps traders analyze the degree to which wins are greater than losses.
$149,020 / $159,000 = 0.94 
The above equation shows the same gross profit as the first equation, but substitutes a hypothetical value for the gross loss. In this case, the gross loss is greater than the gross profit, resulting in a profit factor that is less than one. This would be a losing system.
Percent Profitable
The percent profitable is also known as the probability of winning. This metric is calculated by dividing the number of winning trades by the total number of trades for a specified period. In the example shown in Figure 1, the percent profitable is calculated as follows:
The ideal value for the percent profitable metric will vary depending on the trader's style. Traders who typically go for larger moves, with greater profits, only require a low percent profitable value to maintain a winning system. This is because the trades that do win (that are profitable) are usually quite large. A good example of this is trend following traders. As few as 40% of trades might be profitable and still produce a very profitable system because the trades that do win follow the trend and typically achieve large gains. The trades that do not win are usually closed for a small loss.
Intraday traders, and particularly scalpers, who look to gain small amount on any one trade while risking a similar amount will require a higher percent profitable metric to create a winning system. This is due to the fact that the winning trades tend to be close in value to the losing trades; in order to "get ahead" there needs to be a significantly higher percent profitable. In other words, more trades need to be winners, since each win is relatively small. (To learn more, see Scalping: Small Quick Profits Can Add Up.)
Average Trade Net Profit
The average trade net profit is the expectancy of the system: it represents the average amount of money that was won or lost per trade. The average trade net profit is calculated by dividing the total net profit by the total number of trades. In our example from Figure 1, the average trade net profit is calculated as follows:
In other words, over time we could expect that each trade generated by this system will average $452.79. This takes into consideration both winning and losing trades since it is based on the total net profit.
This number can be skewed by anoutlier, a single trade that creates a profit (or loss) many times greater than a typical trade. An outlier can create unrealistic results by overinflating the average trade net profit. One outlier can make a system appear significantly more (or less) profitable than it is statistically. The outlier can be removed to allow for more precise evaluation. If the success of the trading system in backtesting depends on an outlier, the system needs to be further refined.
Maximum Drawdown
The maximum drawdown metric refers to the "worst case scenario" for a trading period. It measures the greatest distance, or loss, from a previous equity peak. This metric can help measure the amount of risk incurred by a system and determine if a system is practical based on account size. If the largest amount of money that a trader is willing to risk is less than the maximum drawdown, the trading system is not suitable for the trader. A different system, with a smaller maximum drawdown, should be developed.
This metric is important because it is a reality check for traders. Just about any trader could make a million dollars  if they could risk ten million. The maximum drawdown metric needs to be in line with the trader's risk tolerance and trading account size. (For more, see Protect Yourself From Market Loss.)
The Bottom Line
Strategy performance reports, whether applied to historical or live trading results can provide a powerful tool for assisting traders in evaluating their trading systems. While it is easy to pay attention to just the bottom line, or total net profit  we all want to know how much money a system makes  additional performance metrics can provide a more comprehensive view of a system's performance. (To learn more, check out Create Your Own Trading Strategies.)

Mutual Funds & ETFs
ETF Analysis: WisdomTree SmallCap Earnings
Discover the WisdomTree Small Cap Earnings ETF, a fund with a special focus on smallcap and microcap stocks with positive earnings. 
Mutual Funds & ETFs
ETF Analysis: iShares US Regional Banks
Obtain information and analysis of the iShares US Regional Banks ETF for investors seeking particular exposure to regional bank stocks. 
Mutual Funds & ETFs
ETF Analysis: PowerShares S&P 500 Low Volatility
Find out about the PowerShares S&P 500 Low Volatility ETF, and learn detailed information about this fund that provides exposure to lowvolatility stocks. 
Chart Advisor
Stocks to Short...When the Dust Settles
Four short trades to consider, but not quite yet. Let the dust settle and wait for a pullback to resistance for a higher probability trade. 
Technical Indicators
Using Moving Averages To Trade The Volatility Index (VIX)
VIX moving averages smooth out the natural choppiness of the indicator, letting traders and market timers access reliable sentiment and volatility data. 
Mutual Funds & ETFs
ETF Analysis: Vanguard IntermediateTerm Bond
Find out about the Vanguard IntermediateTerm Bond ETF, and delve into detailed analysis of this fund that invests in investmentgrade intermediateterm bonds. 
Technical Indicators
Key Financial Ratios to Analyze the Mining Industry
Discover some the most important financial ratios used by investors and analysts to evaluate companies in the metals and mining industry. 
Technical Indicators
Key Financial Ratios to Analyze Retail Banks
Learn about key financial metrics that investors use to evaluate retail banks, and how the industry is fundamentally different from most other industries. 
Technical Indicators
Key Financial Ratios to Analyze Airline Companies
Examine some of the most important financial ratios and performance metrics investors use to evaluate companies in the airline industry. 
Stock Analysis
The 5 Biggest Canadian Oil Companies
Obtain information about some of the largest and most successful major integrated oil corporations that are headquartered in Canada.

ExchangeTraded Fund (ETF)
A security that tracks an index, a commodity or a basket of assets ... 
Profit Margin
A category of ratios measuring profitability calculated as net ... 
Quarter  Q1, Q2, Q3, Q4
A threemonth period on a financial calendar that acts as a basis ... 
Discount Bond
A bond that is issued for less than its par (or face) value, ... 
Debt Ratio
A financial ratio that measures the extent of a company’s or ... 
PriceEarnings Ratio  P/E Ratio
The PricetoEarnings Ratio or P/E ratio is a ratio for valuing ...

What is the formula for calculating compound annual growth rate (CAGR) in Excel?
The compound annual growth rate, or CAGR for short, measures the return on an investment over a certain period of time. Below ... Read Full Answer >> 
What assumptions are made when conducting a ttest?
The common assumptions made when doing a ttest include those regarding the scale of measurement, random sampling, normality ... Read Full Answer >> 
When does the fixed charge coverage ratio suggest that a company should stop borrowing ...
Since the fixed charge coverage ratio indicates the number of times a company is capable of making its fixed charge payments ... Read Full Answer >> 
What is the difference between the return on total assets and an interest rate?
Return on total assets (ROTA) represents one of the profitability metrics. It is calculated by taking a company's earnings ... Read Full Answer >> 
What does a high turnover ratio signify for an investment fund?
If an investment fund has a high turnover ratio, it indicates it replaces most or all of its holdings over a oneyear period. ... Read Full Answer >> 
What is the utility function and how is it calculated?
In economics, utility function is an important concept that measures preferences over a set of goods and services. Utility ... Read Full Answer >>