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                                     Trade Volume Index indicator and user function and paint bar for Tradestation .


Trade Volume Index is also available for MultiCharts


This Indicator was conceptualised by Steve B Achelis and is a remarkable piece of ingenuity.


For smooth and simple definition of volume action this indicator is a real gem for definition


Trade volume index makes its calculation from both volume and price in a combined algorithm which is remarkably elegant in its design.





   From Steve B Achelis, author of Technical Analysis from A-Z 


Trade Volume Index (TVI) show whether a security is being accumulated (bought) or distributed (sold).

The TVI is designed to be calculated using intraday tick price data.

The TVI is based on the premise that trades taking place at higher "asking" prices are buy transactions and trades at the lower "bid" price prices are sell transactions.

When prices create a flat resistance level and the TVI is rising, look for a breakout to the upside. When prices create a flat support level and the TVI is falling, look for prices to drop below the support level.

  • Steve Achelis is one of the most highly regarded technicians of the last 30 years, I have always admired his work

  • The raw indicator in its original for is the best one to use for tick data studies.

  • The adjustable indicator modified by Precision Trading Systems has a multitude of other uses

  • Gives you a simple at a glance single line showing selling or buying action FAST

  • Can be used in signals and systems

  • Adjustable length settings

  • Adjustable double smoothing

  • If length are smoothing are both set to 1 it plots the raw indicator in its original form as designed by Mr Steve Achelis.


If you need any other free indicators in Easy Language please view the list available here at the bottom of the page



    Why do you need this indicator?           First lets see this indicator in its raw form (Length set to 1, smoothing,1 ).

 Then set length to 7 and smoothing to 4, notice the clarity of trend definition..... 

                            Generally, one can filter buy signals which are not validated by the rising TVI line...........


Trade volume index indicator ELA code is available free to those who score above 1100 in the Weekly Trading IQ game


To qualify for your free Insync index ela file, just create a free account and score 1150 or greater in the weekly contest

 then drop me an email with your account name. You will receive the indicator shortly after.






 Add some Paint bar highlights....Falling TVI = Red bars.... TVI warned of top, and warned down trend is not over (centre)

  This highlights when TVI > 30 day moving average of TVI, it can also be used to construct signals and systems............

                The trends are highlighted by the TVI show whether prices are being distributed or accumulated.....

                                      Trade Volume Index adds an extra dimension to your trading signals.


The following code adds Trade volume index as a filter to confirm parabolic SAR (capital letters part)


Inputs: AccelFactor(.02), Length(12),Smooth(3);
Variables: ParabolicValue(0), TVI(0);

ParabolicValue = Parabolic(AccelFactor);

TVI = Tradevolumeindex(Length,smooth);



Then Sell ("Pblc") Next Bar at ParabolicValue Stop;



                                          Trade Volume Index Indicator + function + paint bar for Tradestation and Multicharts

To summarise in plain words, the TVI indicator, function and paint bar study is a valuable addition to the tool kit of any trader from novices to seasoned professionals, as well as a useful confirmation of buying or selling to add into system signals. It can be used on real-time tick data as Steve Achelis originally intended, or it can be used to analyse longer term time horizons ( real time or static end of day data ) which have volume data sets. 


Important note.


You must have volume data for Trade Volume Index to function. If there is no volume data, then TVI will not return a value.


If you like Trade volume Index then you might be interested in the Precision Index Oscillator below


 Introducing the Precision Index Oscillator  (PI-OSC)  

    Created to provide trade timing signals by Precision Trading Systems in 2009,  a consensus indicator which has some powerful improvements and differences to other industry standard oscillators. At first glance to the untrained eye it would appear like another other oscillator, but when testing it side by side comparing system performance the true power of this excellent indicator begin to emerge.


Read more about Precision Index Oscillator or (PI-OSC)  




Systems, Indicators and user functions for Tradestation


This collection of user functions and indicators below have been carefully assembled to provide a versatile tool kit for the advanced trader.

None of the items below have lots of flashing lights, bells or buttons as you find in the "Holy grail" type worthless advertisements, and all have been carefully chosen because they actually work as trading tools

Some have been coded by myself while others are the work of some of the best technicians worldwide.



If you need any indicator, functions or systems coded into Easy Language, Ninja trader, MT4 or Metastock format, then feel free request it.

© Roger Medcalf 2005 - 2017 ... You may not reprint text or images without permission





Compatible with....

Indicator + Strategy + Paintbar

PLA Dynamical GOLD


A highly complex moving average for advanced users only


Features include 101 speeds per length, overshoot on-off feature, anti-reverse on- off feature to reduce over trading, adjustable anti-reverse fractal percentages, fast start algorithm, paint bar, strategy and function which can be called by your own bespoke studies .

Read more


Price $133 (Pay-Pal)  Buy this item

Stocks, Futures, Bonds, Forex, Indices etc

Author: Precision Trading Systems. (Protected EL code)

Compatible with....

  Indicator + function

Precision Probability Index

An oscillator that measures the exact mathematical probability of one moving average being greater than another. Immensely versatile in its applications this indicator will help you make informed decisions by giving you the exact odds of your trade working out to the inputted bars into the future that you choose. When varying the settings this indicator can be made to work as a DSP binary trend indicator, or perform in the similar way as the popular  market tracker indicator by Indexia research. Read more



Price $245 (Pay-Pal)  Buy this item

Stocks, Futures, Bonds, Forex, Indices etc

Author: Precision Trading Systems. (Protected EL code)

Compatible with....


Volume flow indicator (VFI)

Designed by Markos Katsanos this oscillator has many excellent qualities. Useful as a trend confirmation indicator, an overbought oversold oscillator, divergences between the price and the VFI are usually very reliable

VFI gets the vote of confidence from Precision trading systems as being a "must have" tool in the discerning traders kit

Please click below to see some more detailed examples of charts with the VFI plotted...More details and examples


FREE  with 1125 Trading IQ points (See bottom of page for details)

Stocks, Futures, Bonds, Forex (needs volume to run)


Author: Markos Katsanos. (Open EL code)

Compatible with....          Indicator + function

Demand Index

An excellent oscillator that is versatile in its applications, computing its values from price and volume. It can be used as a divergence indicator and a trend following indicator. I have added a smoothing length feature to suit the needs of the individual user.

I find this indicator very useful for observing intra-day price action in actively traded stocks and futures...........More details and examples

FREE  with 1200 Trading IQ points (See bottom of page for details)

Stocks, Futures, Bonds, Forex, Indices etc

Author: James Sibbet. ( Protected code )

Compatible with....    Indicator + function + signal

Precision Stop

Trend following system and indicator that self adjusts its distance to suit noise levels and volatility factors, making it more "intelligent" than Parabolic SAR, or ATR type indicators.

Can be adjusted to suit any time frame from day-trading to long term trend following by adjusting MULTI settings, features include a neat max and min percentage distance setting to cater for individual tastes.

Takes the guess work out of knowing when the trend is up or down, based on your own input values......*NEW*  Video simulation


Price $125 (Pay-Pal)   Buy this item

Stocks, Futures, Bonds, Forex, Indices etc


Author: Precision Trading Systems. (Protected EL code)

Compatible with....          Indicator + function                                     Insync Index

A "consensus" oscillator that highlights trend turning points, computing its values from an array of standard oscillators such as RSI Stochastic and Money Flow index.

It is best applied to range bound markets rather than trending ones.


I have added a REALVOLUME true-false feature  for users who use both tick volume and trade volume..........More details and examples


FREE  with 1150 Trading IQ points (See bottom of page for details)   

Stocks, Futures (Unsuitable for Forex)


Author: Norm North. ( Open EL code )

Compatible with....           Indicator + function                       Precision divergence finder

A complex piece of code that observes multiple look backs of Demand Index lengths to hunt out when divergences exist.

Often produces stunning signals at exact market bottoms.

This is not an "always in the market" indicator and only flags up when sets up occur that show a real divergence in a market.

As Demand Index uses volume, to perform at its best this indicator needs real volume enabled..............More details and examples


Price $167  (Pay-Pal)   Buy this item

Stocks, Futures, Bonds  (Unsuitable for Forex)


Author: Precision Trading Systems. (Protected EL code)

Compatible with....              Indicator + function                     Trade Volume Index  ( TVI )

Beautiful piece of work by Steve B Achelis, which I used in some of my early systems. Makes for a smooth analysis of volumes flowing in and out of markets and has always been one of my favourites.

I have altered the code to allow length changes and smoothing.


Adds the "Volume dimension" to your price analysis in a clear and precise manner. This indicator is a valuable addition to system filters to confirm trend direction...........More


FREE  with 1100 Trading IQ points (See bottom of page for details)

Stocks, Futures, Bonds, Forex, Indices etc


Author: Steve B Achelis. ( Protected EL code)

Compatible with....              Indicator + function                                    Q-Stick

A Simple and yet very efficient way of defining if a trend is in a bull or bear phase. Probably the best piece of work that Chande ever turned out, and yet seemingly forgotten by the whole world.

Setting lengths to 80 or more makes for a smooth analysis of trend, and the crossing of zero indicates trend direction.


See how early it signalled a bear move in the example when it crossed zero. Can be used as an short term oscillator with lengths less than 10 and often gives very early signals...More


FREE  with 1050 Trading IQ points (See bottom of page for details)

Stocks, Futures, Bonds, Forex, Indices etc


Author: Tushar Chande. ( Protected EL code)

Compatible with....                Indicator + function Precision Volume (Tick volume for real-time )

An indicator I made for measuring demand-supply imbalances.

This indicator will only work correctly if used on real time data with tick volume enabled.


Early warning indicator ( Requires confirmation )

An oscillator type indicator which measures demand and supply imbalances in an easily understood form


Above zero = Demand > Supply over sampling period


New indicator highs or lows over a chosen long length of (100 bars+) often foretell a strong move is coming..........More


FREE    with 1025 Trading IQ points (See bottom of page for details)

Stocks, Futures, non-traded Indices (Unsuitable for Forex)


Author: Precision Trading Systems. (Protected EL code)

Compatible with....           Indicator + function           Precision Index Oscillator ( Pi-Osc )


Highly sophisticated "consensus" indicator comprised of many different component signals. A real technicians tool that measures everything from divergences to probabilities to unique chart patterns in a single market indicator. 

Best results are given when analysing range bound and choppy markets rather than trending ones. Version 2 is not available yet.


Some of its components use real volume so for this to perform at its best this indicator needs real volume............More


Price $397  (Pay-Pal)   Buy this item

Stocks, Futures, Bonds  


Author: Precision Trading Systems. (Protected EL code)

Compatible with....

 Indicator + function + Signal

Precision Mach-Trend

Designed to reduce whipsaw trades in trending periods and help the user reduce costly F expenses.

Mach-Trend is superbly simple to use, and is suitable for all ranges of traders. Calculated using advanced mathematics, this indicator will reduce your F and improve your overall performance. Mach-Trend Platinum pro has fully available parameters enabling advanced optimisations for the sophisticated user.........more information.


Price $995  (Pay-Pal)   Buy this item (demo available $197)

Stocks, Futures, Bonds, Forex  


Author: Precision Trading Systems. (Protected EL code)


Compatible with....          Indicator + function                              Precision Gravity System



A complex piece of code that observes multiple phases of planetary orbits, to calculate extreme points of price sets. The relative gravity of the "sun" and "moon" are calculated using advanced physics mathematics.

The first system of its kind to be introduced to stock market trading systems, its is still under developments.........more



Coming soon


Stocks, Futures, Bonds  (Unsuitable for Forex)


Author: Precision Trading Systems. (Protected EL code)

Compatible with....           Indicator + function

  Money flow index MFI


Highly effective volume indicator showing money flowing in and out of securities. Works well as an over bought oversold oscillator and can be used for divergences as well. Ranging between 0 to 100 the MFI crossing above or below 50 can be used to identify a bullish or bearish condition of a trend changing even.....More details and examples


FREE  with 1075 Trading IQ points (See bottom of page for details)

Stocks, Futures, Bonds, Forex, Indices


Author: Unknown. (Open EL code)




FREE and paid Systems and Indicators for Tradestation MultiCharts, MetaTrader4  and NinjaTrader, detailed articles on trading systems, trend following, risk control analytics, optimization, optimal trade size formulas, online calculators, FREE to play Trading IQ Game with massive prizes from our two sponsors NinjaTrader and MultiCharts, tutorial videos, expert trader videos, no nonense content that does exactly as it is described...Time is running out... Credit availability is drying up....US National debt to be equal to 35% of the entire worlds GDP in 3 years....33% of all USA tax revenues will be required just to make the INTEREST PAYMENTS on the collosal national debt...... Eventually the US will have no option other than to print money or default on their debt repayments...... US Dollars will likely cease to be the reserve currency of the world........Stimulus is running out, the Federal reserve has fired all its bullets and the only options left are to print more money or to default on the debt payments.....The problem is infinitely worse than in 1929 due to the added problem of this huge government debt...... In 1929 the USA still had a positive trade surplus and a manufacturing based economy..... In 2011 the USA will have no such resources to fall back on........The two most likely scenarios are both likely to lead to disaster......Hyper-Inflation at 40%+ or Deflationary implosion....... Either of the two possibilities will lead to huge moves in the worlds financial markets........Trading of these massive moves could be the only way out..........Wise proffessional traders have already started building huge dollar short posistions in anticipation of the debacles to come.....Many people will suffer as a result of the irresponsible un-elected Federal reserve operatives..........Many more people will lose their homes......Millions of jobs will be lost......Those who are unprepared will become impoverished in ways that they could never imagine.....What is your strategy to trade these violent market trends?.........ARE YOU  READY?

Precision Trading Systems is partnered with MultiCharts and part of the NinjaTrader Ecosystem

  • Products are provided for both these platforms.
  • Our partners also sponsor the Trading IQ Game
  • Both these trading platforms are excellent


Precision Trading Systems is provider of the following



 Precision Trading Systems is partnered  with MultiCharts.


 Precision Trading Systems is part of the NinjaTrader ecosystem.


 Systems and Indicators for Tradestation, NinjaTrader and MultiCharts.


 Top quality paid & FREE trading systems and indicators for most platforms


 Members can receive some paid products completely FREE


 Roger Medcalf is a vendor on the Tradestation App store


 Roger Medcalf is a vendor of products of MetaTrader 4



  Free to play Trading IQ Game with generous PRIZES  from our sponsors.


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  • Futures, Forex and Stock trading contain substantial risk and are not for every investor.

  • An investor could potentially lose all or more of the initial investment.

  • Risk capital is money that can be lost without jeopardizing ones financial security or lifestyle.

  • Only risk capital should be used for trading

  • Only those with sufficient risk capital should consider trading.

  • Past performance is not necessarily indicative of future results.





Hypothetical performance results have many inherent limitations, some of which are described below. no representation is being made that any account will or is likely to achieve profits or losses similar to those shown; in fact, there are frequently sharp differences between hypothetical performance results and the actual results subsequently achieved by any particular trading program. One of the limitations of hypothetical performance results is that they are generally prepared with the benefit of hindsight. In addition, hypothetical trading does not involve financial risk, and no hypothetical trading record can completely account for the impact of financial risk of actual trading. for example, the ability to withstand losses or to adhere to a particular trading program in spite of trading losses are material points which can also adversely affect actual trading results. There are numerous other factors related to the markets in general or to the implementation of any specific trading program which cannot be fully accounted for in the preparation of hypothetical performance results and all which can adversely affect trading results.



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