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Scan results seem to be incorrect
I ran a very simple scan for Bollinger Bands and set it with "Starting 14 trading days before the Last Market Close (8 Feb). But what I get are some stocks that do NOT meet the scan's conditions 14 days ago (Jan 18th). I also changed the number of 'trading days ago' (like 5, 7, etc) and again it seems the engine produces incorrect results. Here is the scan:
[type = stock]
and [country = us]
and [group is not ETF]
and [Close > 10] and
and [Volume > 100000]
and [Min(1,BB Width(20,2)) < 5]
and [%B(20,2) < .8]
and [%B(20,2) > .2]
Specifically, the [Min(1,BB Width(20,2)) < 5] is not met in many of the scan results for Jan 18th (it shows the BB Width value to be > 5.
Any idea why? Am I missing something?