Backtesting

[gg80108]

Just trying to keep things straight.. The only tool that NT has available to test closer to real time is the replay data recorded during the day? Is there any stats available for the replay of day data, I could not find any..
The rest of NT tools uses "bar data"?

[NinjaTrader_RyanM1]

Hello gg80108,

Market replay data is a stream of data. Daily bars can be built with this stream, but are not represented the exact same way you would see on a chart. The daily bar will be built as new ticks arrive.

[gg80108]

Isnt' there some information somewhere on the pitfalls of backtesting with NT??? looked, couldnt exactly find it

[NinjaTrader_RyanM1]

This might be what you're looking for:

http://www.ninjatrader-support.com/HelpGuideV6/DiscrepanciesReal-TimeVsBacktest.html

[gg80108]

ya thats it..
the term "backtest" is used throughout this doc.. This excludes the Market Replay feature?
Backtest data is the same as historical?

[NinjaTrader_RyanM1]

Correct. From the first paragraph:

You should expect that a strategy running real-time (live brokerage account, live market simulation, Market Replay etc...) will produce different results than the performance results generated during a backtest.

[gg80108]

So just being the devils advocate,, why would anyone spend their time using this if its not going to simulate real time if u are testing for profitability...? what did I miss? why bother to keep all those stats since they are suspect.. then what are u optimizing?
Or is just to to test the mechanics of ur strategy,, is that it? Keeping those stats is really misleading IMHO ......

[NinjaTrader_RyanM1]

It's a tool for analysis and I'm sure many find it to be invaluable. The document you're reading is designed to inform users about what to expect when using this tool. We recommend using all the tools and tests you need to develop your strategy - backtest, forward test, optimize, and analyze.

http://www.ninjatrader-support.com/HelpGuideV6/DevelopTradingLogic.html