DEFINITION of 'Trade Signal'

A trade signal is a trigger for action, either to buy or sell a security or other asset, generated by analysis. That analysis can be human generated using technical indicators. Or it can be generated using mathematical algorithms based on market action, possibly in combination with extra-market factors such as economic indicators.

BREAKING DOWN 'Trade Signal'

Trade signals can use a variety of inputs from several disciplines. Typically, technical analysis is a major component but fundamental analysis, quantitative analysis and economics can also be inputs. They can include sentiment measures and even signals from other trade signal systems. The goal is to give investors and traders a mechanical method, devoid of emotion, to buy or sell a security or other asset.

Aside from simple buy and sell triggers, trade signals can be used to modify a portfolio by determining when it might be a good time to buy more of one particular sector, such as technology, and lighten up on another, such as consumer staples. Bond traders could have signals for adjusting the duration of their portfolios by selling one maturity and buying a different maturity.  And finally, it can also help with asset class allocation such as shifting money among stocks, bonds and gold.

There is no limit to how complex a trade signal can be. However, traders tend to keep things simple using only a handful of inputs. For practical purposes, it is far easier to manage a simple signal generator and periodically test it to see what components need adjusting or replacing. Too many inputs would introduce complexity requiring more time than a trader has to offer. And since markets change over time, often with great speed, complex strategies could be rendered obsolete before testing is even finished.

Creating a Trade Signal

Again, there are endless possibilities but traders tend to just want to automate their thinking. An example might be, "for a stock with lower than a cetain price/earnings ratio, buy when a certain technical formation breaks out to the upside and prices are above a certain moving average and interest rates are falling."

Here are several of the more common inputs. Traders can combine them as they wish to meet whatever criterion they use to select trades.

Technical pattern breakout or break down. These can include triangles, rectangles, head-and-shoulders and trendlines.

Moving average cross. Most investors watch 50- and 200-day moving averages but there are many others in common use. The input could be when trading activity crosses above or below the average. Or, it could be when two averages cross each other.

Volume surge. Unusually high volume is often a precursor to a new move in the market. In the futures markets, open interest can also be used.

Interest rates. Changes in rates can often suggest changes in stock and commodity markets.

Volatility. There are many ways to measure volatility, and as with other indicators, extreme highs or lows in volatility can trigger market changes.

Cycles. Markets of all types tend to ebb and flow over time, even if they are in a steady trend or in a non-trending condition. One of the more widely known cycle is the seasonal cycle for stocks —sell in May and go away —which could help determine if a strategy is operating in the strong or weak half of the year.

Sentiment extremes. Used as a contrary indicator, excessive bullishness according to surveys or actual trading activity, can suggest market tops. Conversely, excessive bearishness can lead to market bottoms.

Valuation. Excessively high valuation compared to market, sector or stock specific measures can lead to sell signals.

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