Difference between TickData and CalculateOnBarClos

[bonnies]

I want to work with each incoming tick of data volume (price, volume).
I would like to know which is the difference between adding a new tick dataseries as:

Add(PeriodType.Tick, 1);

and then do the script logic inside: if (BarsInProgress==1) then {logic}

or setting the property:

CalculateOnBarClose=false;

and then do the script directly in the OnBarUpdate().

Do they provide the same kind of data?

Thank you.

[NinjaTrader_ChelseaB]

Hello bonnies,

Adding a 1 tick series would allow the script to load the tick data historically to be used for triggering OnBarUpdate for each tick historically as well as to use for fill prices adding granularity to a larger timeframe historically and this would also work in real-time.

http://ninjatrader.com/support/forum/showthread.php?p=442810#post442810

Using CalculateOnBarClose as false would cause OBarUpdate to trigger for each tick in real-time but does not work historically.

http://ninjatrader.com/support/helpGuides/nt7/calculateonbarclose.htm

[bonnies]

Thank you very much for the explanation.

If I add the new tick data series at 1 tick for having the data tick historically and then when running in real time I also set the CalculateOnBarClose to false, what does Ninjatrader in this situation: does it has two tick data series overloading the cpu or it only works with one data tick series because both are the same?

Thank you again for your support.

[NinjaTrader_ChelseaB]

Hi bonnies,

When a bar is closing, OnBarUpdate does not trigger for the tick. So if the primary bar is closing, there isn't a second update for the tick being received.

Which means, if you were to add a 1 tick series to a script and CalculateOnBarClose is false, OnBarUpdate is only going to trigger once for each tick (secondary bar closing) and once for each primary bar update (a tick being received).

In other words you would only see two updates each time a tick comes in instead of 3 (or even 4 when when primary bar closes).