Our formula engine puts a virtually limitless library of technical analysis at your fingertips.

With Advanced Charting, eSignal offers a powerful formula engine that opens up for you a world of formula studies. It is written in a simple JavaScript language, eSignal Formula Script (now enhanced as EFS2), so you can develop your own custom studies, access a series of customizable sample formulas or test your trading strategies on days, weeks and years of historical data (more on back testing).

EFS2 means ease of development with few lines of code required, ability to use built-in studies and support for building a study of another study, such as a Moving Average of an RSI. It allows you to create studies based on different intervals and symbols. For example, you can view the 30-minute MACD of the Dow in a study panel while simultaneously looking at a 5-minute MSFT chart

Customizable Sample Formula Studies
In addition to the technical indicators that come with advanced charting, there is a library of sample formula studies saved in plain text as .efs files in the formula folder under the eSignal directory. You can use them as-is or view and modify them in the text editor to suit your trading strategies.

Free Indicators
The library includes, at no extra charge, indicators such as Bollinger Bands and Bollinger's Normalized Volume (which compares volume on a relative basis from stock to stock and time to time) and Intraday Intensity (depicts flow of funds for a security based on close within range), the DiNapoli Indicators (a trading methodology that gives you predefined entry levels, reasonably tight stops and precalculated profit objectives as soon as you enter a move), the Kase Pivot (which highlights market turns) and Teresa Lo's Power Swings Indicator (a visual tool for spotting critical decision support information in a chart). Read more about these indicators that come free with your eSignal application.

Build-Your-Own Capability
eSignal also has partnerships with a number of developers expert in EFS, as well as other scripting languages. They can work with you to convert existing code into a strategy or to create a strategy from scratch. Here's a list of EFS Developers. Users may also post (and access) EFS suggestions and comments on the EFS Studies Forum.

Create your own custom formula that can plot visual indicators on the price bars, or create a custom study on its own panel.

Premium Add-On Studies
Advanced charting also makes possible compatibility with a number of valuable proprietary premium studies from market experts, such as the Advanced GET studies in eSignal, Advanced GET Edition, and the Bollinger Band Tool Kit, which features variations on, as well as indicators and systems derived from, normalized with and / or employing Bollinger Bands. Find out more about these premium studies.

eSignal Formula Script (now EFS2!) Features and Benefits
	EFS2 Performance Monitor (on the View menu) lets you monitor the amount of CPU usage of a particular study.
	EFS2 talks to broker plug-ins, so you can develop a study or strategy that can initiate a trading action.
	EFS2 allows you to include a study within a study using "Built-Ins" (e.g., an MOV of RSI). This feature reduces the amount of work involved in creating certain formulas and provides additional CPU relief.
	The built-in study properties editing function makes changes easy.
	You can build a study of another study and create studies based on different intervals and symbols.
	EFS2 requires fewer lines of code than EFS, cutting development time by up to 85 percent!