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Robbie, I was doing fine until I got to the last date "through 10/4/2011". To me it seems to be saying that the afternoon values of 10/4 are used to make a purchase on the morning of 10/4?? What am I missing?

You're not missing anything--that was my mistake from copying, pasting and editing in too big of a hurry. Here's my correction:

Next-day open

When "Next-day open" is selected, all trades happen at open prices of the next market day (10/4/2011), no matter what lag settings exist in the referenced screen. Remember, GTR1 "lag" settings refer to data lag, not trading lag. So five stocks are bought at 10/4/2011 opening prices.

But which five stocks, exactly? This time, the Hacktester does make a change to the Nas100Momentum URL, converting it to , which trades at open prices.

But as before, lag settings in the URL for Nas100Momentum are blank. Thus the default lag adjustments of zero are applied in backtesting mode. Since all of the screen's fields use a lag of 1 market day, there is effectively a lag of one market day (or "overnight" lag, when trading at the open) in Nas100Momentum backtests. So at the open of 10/4/2011, the hacktest buys the five stocks in the NASDAQ 100 on 10/3/2011 that had the highest 252-day total returns through 10/3/2011.

Robbie Geary
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