StockFetcher Forums · Filter Exchange · Very sad: "date offset" does NOT support all features!<< >>Post Follow-up
elnaffar
4 posts
msg #31705
Ignore elnaffar
4/13/2004 10:35:36 AM

If you try the following filter you will realize that "date offset" has no effect on the way the channel is computed. In other words, you CANNOT back-test any filter in which you use "channel". I believe it is the same concern for other features such as the SLOPE.

"Price trading near the bottom of a increasing 180 day channel
and date offset 30"

StockFetcher confirmed this fact to me. Hope they are working on it.


txtrapper
548 posts
msg #31706
Ignore txtrapper
4/13/2004 10:52:47 AM

It works for me, you left out "is"

Fetcher[Price trading near the bottom of a increasing 180 day channel and date offset is 0]



Then backtest with "and date offset is 30"


TxTrapper


elnaffar
4 posts
msg #31707
Ignore elnaffar
4/13/2004 12:07:55 PM

txtrapper,
I made more experiments and I tend to say that we are both right. Try this filter today :

"Price trading near the bottom of a increasing 180 day channel and date offset is 60 and chart-length is 12 months"

One of the symbols returned is QLGC in which the channel appears with a -ve slope, i.e., it is decreasing! What I realized that the "displayed" channel is computed based on up-to-date stock prices and ignoring the offset. Nevertheless, 60 days ago the channel was truely increasing and the price was near bottom, BUT, the lines of that channel is not drawn. What is drawn is today's channel. In other words, the filter is actually working but the displayed channel is incorrect. You can verify this hypothesis if you look at the chart. You will realize that the price 60 days ago is near the TOP of the "displayed" channel. While it is actually the bottom of the channel calculated 60 days ago, which means that the filter worked correctly.

By the way, and since I am kind of knowing how the command processor works in StockFetcher, using "is" is not needed in "and date offset is 60". You could take it out or you can even write "and date offset txtrapper 60" or even "and offset txtrapper 60" (without 'date')

It works! ;-)

Elnaffar


txtrapper
548 posts
msg #31714
Ignore txtrapper
4/13/2004 7:49:18 PM

Try;

"2 months" instead of 60 days.


Txtrapper


StockFetcher Forums · Filter Exchange · Very sad: "date offset" does NOT support all features!<< >>Post Follow-up

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