I would like to practice using market replay, but I don't plan to trade tick by tick or even intra-day. So I was wondering why I can't practice against historical data, which already has all the bars I need. Currently, I "practice" by running my strategy against historical data, and poring over the strategy analyzer chart to try to project myself to that day, trying to guess how I might have felt if I were watching that latest bar freshly and not knowing what would happen next. This is surprisingly hard to do with the hindsight I already have.
I suppose that fundamentally, I don't understand why NT has to collect the market data and play it back in real-time when the historical data is just sitting there at the data provider's DB--and you have no problem using it in the strategy analyzer and chart display. For someone who plans to trade on a day timescale, the market reply seems to be an overkill. But then again, maybe the majority of the traders trade based on tick-by-tick chart. So I am wondering if I am missing something...
-Henry
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