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Strategies & Market Trends : TA-Quotes Plus
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To: Alain Joaris who wrote (5567)7/24/1998 1:58:00 PM
From: Rick Slemmer  Read Replies (1) of 11149
 
Alain:

Backtesting doesn't work with QP1, since the loop(0,-250) starts the scan at Day(0) and goes back to Day(-250), so the first hit is not what you might be looking for while backtesting (I think this is the same problem with QP2).

I backtest regularly using QP1. All that's needed is to write the scan so that the point of interest is -3 or however many days ago. F'rinstance:

I want to know how an 10-day/50-day MA crossover will reflect empirically in 3 days. The scan goes something like this:

10-dma(-5) < 50-dma(-5)
10-dma(-3) > 50-dma(-3) [Crossover happened on day -4 or -3]
Println Close(0)

This is, of course, a very simple rendition. By adding a Loop statement, you can get as many 10/50-dma crossovers as you want to examine. I've asked Gary to implement a "show me" function in QP3 to show where specified conditions are met on a historical chart.

Hope this helps.

RS
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