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Re: [amibroker] back test versus porfolio back test



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Dave,
 
Please check your e-mail box. Your bug report is replied. 


 
Best regards,Tomasz Janeczkoamibroker.com
<BLOCKQUOTE 
>
  ----- Original Message ----- 
  <DIV 
  >From: 
  Dave Merrill 
  
  To: <A title=amibroker@xxxxxxxxxxxxxxx 
  href="">amibroker@xxxxxxxxxxxxxxx 
  Sent: Thursday, October 09, 2003 7:03 
  PM
  Subject: RE: [amibroker] back test versus 
  porfolio back test
  
  <SPAN 
  class=642595516-09102003>all understood tomasz.
  <SPAN 
  class=642595516-09102003> 
  <SPAN 
  class=642595516-09102003>sorry if I seemed impatient, didn't mean to at all. I 
  know you have a ton of stuff on your plate, and my situation wasn't simple. I 
  also know that I've been the perpetrator of many a user error 
  (:-)...
  <SPAN 
  class=642595516-09102003> 
  <SPAN 
  class=642595516-09102003>the original post I replied to was on the main list, 
  so that's where I replied. I'm not sure if yuki's on the beta list or 
  not.
  <SPAN 
  class=642595516-09102003> 
  <SPAN 
  class=642595516-09102003>take care,
  <SPAN 
  class=642595516-09102003> 
  <SPAN 
  class=642595516-09102003>dave
  <SPAN 
  class=642595516-09102003> 
  <BLOCKQUOTE 
  >
    First: there is a list to discuss beta 
    releases:
    <A 
    href="">amibroker-beta@xxxxxxxxxxxxxxx 
    
     
    <A 
    href="">http://www.egroups.com/messages/amibroker-beta
     
    Second thing: there are no known problems with 
    portfolio backtester in regular mode
     
    Third thing: your bug report is in the queue. You did not 
    received the answer because
    I have lot of support work (not connected with bug 
    reports) and bug reports are time consuming
    so they are processed with 2nd priority.
     
    Fourth thing: upto now I have received a couple of 'bug 
    reports' about portfolio backtester
    but each turned out to be user error. 
     
    Best regards,Tomasz Janeczkoamibroker.com
    <BLOCKQUOTE 
    >
      ----- Original Message ----- 
      <DIV 
      >From: 
      Dave Merrill 
      
      To: <A 
      title=amibroker@xxxxxxxxxxxxxxx 
      href="">amibroker@xxxxxxxxxxxxxxx 
      
      Sent: Thursday, October 09, 2003 4:34 
      PM
      Subject: RE: [amibroker] back test 
      versus porfolio back test
      
      <SPAN 
      class=928301414-09102003>have you checked if there are important 
      differences in the actual trades? I assume, since you're 
      comparing the results, that you're not using any portfolio features 
      that you *want* to make it behave differently in that mode, 
      right?
      <SPAN 
      class=928301414-09102003> 
      <SPAN 
      class=928301414-09102003>one reason I ask about the actual trades is that 
      while working on portfolio-based systems recently, I've noticed what may 
      be some strange sell behavior, or rather lack of sells. it's come up in a 
      pretty complex environment, and I'm not 100% certain my code isn't causing 
      it in some way, but I haven't seen how it is, yet. I sent in a possible 
      bug report about it and haven't heard back, probably because it's not a 
      simple, easy to isolate situation that would have been easy to confirm or 
      explain away.
      <SPAN 
      class=928301414-09102003> 
      <SPAN 
      class=928301414-09102003>for example, one system switching on fairly 
      fast indicators showed some holdings lasting multiple years. I can 
      see on the charts that the relevant indicators crossed their thresholds 
      many times, without generating a sell. also, the system had a 30% stop 
      loss in place, that likewise didn't sell. I discovered this while 
      investigating some trades with uncharacteristically large losses, like 
      87%. sometimes things like that do happen if a stock breaks really quickly 
      through your stop, but here, the losses occurred over a very long period. 
      the expected sells never occurred, neither from my indicator-based code 
      nor from the stop loss.
      <SPAN 
      class=928301414-09102003> 
      <SPAN 
      class=928301414-09102003>as I said, I wrote <A 
      href="">bugs@xxxxxxxxxxxxx about this; 
      hopefully I'll hear back at some point.
      <SPAN 
      class=928301414-09102003> 
      <SPAN 
      class=928301414-09102003>dave
      <BLOCKQUOTE 
      >I'm 
        playing with some simple ideas right now, and I find that I 
        amgetting dramatically different test results from the regular 
        backtester and the new portfolio back tester.  I realize the 
        latter is abeta while the former is not, however the former is 
        showing a niceprofit on the report summary, while the latter is 
        showing a loss.Anyone else getting conflicting results like 
        that?  Shouldn't themoney totals be the 
      same?YukiSend 
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