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Portfolio Filter inflection point and trades

Posted: Fri Jun 17, 2011 3:23 pm
by MarkS
I noticed the last few days that my MACD filter on the Donchian system is at an inflection point on one commodity I trade. So it will show long trade entries for a few days, then the next day the long disappears (it is rejected) and the order list shows a short trade entry point as the MACD flips about.

Yesterday, using data from 6/15, I had a buy stop order to go long this market on 6/16. This did not get triggered. However, once I downloaded the data after the close on 6/16, it no longer showed any active long order (it shows up on the rejected list spreadsheet instead) but it does show that a short order was supposed to be filled.

Going back to my generated orders on 6/15, there was no indication to have a short stop in the market at all, since it was being rejected by the portfolio filter and I was supposed to have a long order active. Anyone else had issues similar to this? Is there a reason why TB is assuming it went short? Any workarounds?

Posted: Fri Jun 17, 2011 3:49 pm
by LeviF
Maybe another case of change in the data? What happens now if you set test end date to 6/15 and generate orders?

Posted: Fri Jun 17, 2011 4:26 pm
by Tim Arnold
Set the test end date, generate orders, then set the test end date ahead and generate orders. If everything looks ok then it was a data change issue. One of the things I do is use Generate Forward in CSI UA to help stabilize the data. But if CSI made data corrections or otherwise, then things can change as the historical data changes.

Posted: Fri Jun 17, 2011 8:08 pm
by MarkS
Thank you gentlemen. Tim -- That is exactly what I had done to test the order, and everything else across all markets was fine, thus it must be a data issue. The contract in particular is the Rough Rice, July. Disturbing to see how data can "change" after the fact. Now the decision becomes to chase the order 1.6%, let it slide, or put in a limit and see if I get filled (but then it is technically moving in the wrong direction!).

Posted: Sat Jun 18, 2011 1:27 am
by marriot
Hi Tim,
what could be the problems if you make TB to save data allowing Csi just
to add Last day?

thank you.

Posted: Sat Jun 18, 2011 4:36 am
by AFJ Garner
MarkS wrote:thus it must be a data issue
Each day make a copy of all your futures and forex ASCII files and place them in a separate dated folder for each day. When you come across such issues you can then easily track down data differences. Once a month or so you can then delete month old ASCII files so as not to accumulate too much clutter. LINK

Posted: Mon Jun 20, 2011 10:57 pm
by michaelt
Hi AFJ, I'm interested in this discussion and your and Tim's suggestions - I see the confusing impact of CSI historical adjustments. You posted a link but for me it's empty.

Moderator's note: that link points into the Trading Blox Customers Only area of the website. It is not accessible unless you're a customer ---> (tutorial)