StockFetcher Forums · General Discussion · Help TOMB! Filter Brain-Teaser<< >>Post Follow-up
chessnut1
53 posts
msg #29877
Ignore chessnut1
11/14/2003 7:44:57 PM

TOMB (or anyone else for that matter),

I am puzzed to discover under what conditions, if any, a search for stocks where the close reached a new 20 day high 10 days ago would NOT also find the stocks where the close reached a new 52 week high 10 days ago.

Here's the thing. I have been running the following filter: "show stocks where the close reached a new 52 week high within the last 10 days and price is between 1 and 10." Then I thought, I will "throw the net wider" and catch more stocks, which will include the recent 52 week high stocks, by using the following filter: "show stocks where the close reached a new 20 day high within the last 10 days and price is between 1 and 10."

This 2nd filter does indeed incorporate all of the stocks found by the first filter, at least in the dozens of times I have run them. At one point it seemed clear to me that this would be the case-- at least on the intuitive level-- but now, as I think about it, I'm hard pressed to logically explain it, or even that it is true in all cases. Seems like there should be some exceptions that I am not noticing.

This has become something of a brain teaser for me, and I can't wrap my simple gray matter around it. Might a clue be found in the "last 10 days" part of the filter?

So, if the reason why filter 2 incorporates results from filter 1 is clear to you, could you explain it to me please? What general rule, such as "ANY greater period high will be a subset of searches specifying a lesser period high" can apply here? And if the phrase, "within the last X days" is a delimiting factor, what price action within that 10 day period might EXCLUDE a new 52-week high stock filter return from appearing?

My brain can't seem to get it. Thanks for your help.

--BJ




gladlynt
3 posts
msg #29902
Ignore gladlynt
11/17/2003 3:48:57 PM

If there was a 52 week high within the last 10 days then it HAS to also be a 20 day high, no way around it. However a 20 day high does not have to be a 52 week high. If you did the 52 week high within the last 30 days, then did a 20 day high within the last 10 days you would get any stocks that hit a new high between 20 & 30 days ago then continued to go up. The best way to do this in 1 filter would be to do a count of new 52 week highs within the last 30 days.


chessnut1
53 posts
msg #29937
Ignore chessnut1
11/18/2003 8:43:39 PM

Thanks gladlynt. You make sense. Mrknd responded to me with a similar bottom-line conclusion in a Muddy Method Group post. Appreciate having two thinkers concur.

--BJ


StockFetcher Forums · General Discussion · Help TOMB! Filter Brain-Teaser<< >>Post Follow-up

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