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Re: [AmiBroker] AmiBroker Tharp System Testing Template



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Hi, Mr. Valley:
 
Sorry for waiting more than a week to respond. I completely forgot. Good 
think I kept your email. Anyway, Amibroker uses ATR(10), which uses 
Wilder's smoothing to compute it, a bastardized form of exponential moving 
average, whereas MA(ATR(1),10) is a simple moving average of daily ranges.So, 
they give slightly different results. I really don't think it matters a whole 
hell of a lot which one you use, but the classical usage is Wilder's. Both are 
correct; some traders use the SMA, others use EMA, and others use Wilder's. It's 
what your choice is and what works best for you. In AB, since it's a built-in 
function, it's easy just to use ATR(x). Now, regarding volatility stops like 3% 
ATR, I'm not sure I follow what it is you are asking, but if you mean ATR as a 
percent of the price, like ATR(10)/C, you can certainly use that as a filter 
(i.e, only buy stocks whose ATR/C is between, say, 2% and 9%). But I don't know 
what you mean when you refer to a %ATR stop. Can you expand upon your question a 
little more? Thanks, and sorry again for being so tardy in responding. 
 
AV
<BLOCKQUOTE 
>
  ----- Original Message ----- 
  <DIV 
  >From: 
  Mr Valley 
  
  To: <A title=amibroker@xxxxxxxxxxxxxxx 
  href="">amibroker@xxxxxxxxxxxxxxx 
  Sent: Saturday, November 29, 2003 10:11 
  AM
  Subject: RE: [AmiBroker] AmiBroker Tharp 
  System Testing Template
  
  <FONT face=Arial color=#0000ff 
  size=2>Al,
  <FONT face=Arial color=#0000ff 
  size=2> 
  <FONT face=Arial color=#0000ff 
  size=2>Thanks,
  <FONT face=Arial color=#0000ff 
  size=2>Why the difference between ATR(10) and MA(ATR(1),10)?  They 
  plot differently...???
  
  /*ATR TEST */<FONT 
  size=1>
  aa = ATR<FONT 
  face=Tahoma size=1>(<FONT face=Tahoma color=#ff00ff 
  size=1>10);
  bb = MA<FONT 
  face=Tahoma size=1>(<FONT face=Tahoma color=#0000ff 
  size=1>ATR(<FONT face=Tahoma 
  color=#ff00ff size=1>1),<FONT 
  face=Tahoma color=#ff00ff size=1>10<FONT face=Tahoma 
  size=1>);<FONT face=Tahoma color=#0000ff 
size=1>
  Plot(aa,<FONT face=Tahoma 
  color=#ff00ff size=1>"aa",<FONT 
  face=Tahoma color=#ff00ff size=1>1<FONT face=Tahoma 
  size=1>,4<FONT 
  face=Tahoma size=1>);
  Plot(bb<FONT 
  size=1>,"<FONT face=Tahoma 
  color=#ff00ff size=1>bb"<FONT 
  size=1>,2<FONT 
  size=1>,4);
  <FONT face=Arial color=#0000ff 
  size=2>Also regarding volatility stops, e.g. 3% ATR?
  <FONT face=Arial color=#0000ff 
  size=2>Thanks,
  <FONT face=Arial color=#0000ff 
  size=2>Mr Valley
  
    <FONT face=Tahoma 
    size=2>-----Original Message-----From: Al Venosa 
    [mailto:advenosa@xxxxxxxxxxxx]Sent: Saturday, November 29, 2003 
    7:44 AMTo: amibroker@xxxxxxxxxxxxxxxSubject: Re: 
    [amibroker] AmiBroker Tharp System Testing Template
    Mr. V:
     
    Try this one-liner: PositionSize = -1 * BuyPrice/(n*ATR(10),m);
     
    The minus 1 says to risk 1% of current equity ($1000 on a $100,000 
    portfolio), which is Tharp's recommendation. The rest of the equation says 
    to adjust that risk by the buyprice/volatility. The volatility denominator 
    determines how many shares to buy. Thus, if the ATR multiplier, n, is 2, 
    then the no. of shares is 1000/2ATR, and when you multiply that by the 
    buyprice, you get the actual dollars invested by Amibroker. 
     
    Al Venosa
    <BLOCKQUOTE 
    >
      ----- Original Message ----- 
      <DIV 
      >From: 
      Mr 
      Valley 
      To: <A 
      title=amibroker@xxxxxxxxxxxxxxx 
      href="">Amibroker 
      Sent: Friday, November 28, 2003 10:46 
      PM
      Subject: [amibroker] AmiBroker Tharp 
      System Testing Template
      
      <SPAN 
      class=125580103-29112003>Has anyone coded a Tharp 
      Volatility based template for AmiBroker they are willing to 
      share?
      <SPAN 
      class=125580103-29112003> 
      I would like 
      to test Tharp's expectancy, position sizing @ 1% risk and % volatility 
      entry and exit stops based on Equity() and R-Multiples
      ...Like the 
      book, to begin with...
      <FONT face=Arial 
      size=2> 
      I'm not good 
      at coding Stops, yet.
      <FONT face=Arial 
      size=2> 
      As an aside, 
      Why is there a difference between ATR(239) and MA(ATR(1),239) ?  
      
      Which is 
      correct, the MA?
      <FONT face=Arial 
      size=2> 
      <FONT face=Arial 
      size=2>Thanks,
      Mr. 
      Valley
      <FONT face=Arial 
      size=2> 
      <FONT face=Arial 
      size=2> 
      <FONT face=Arial 
      size=2> 
      <FONT face=Arial 
      size=2> 
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