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Re: [amibroker] Database purify tool - short instructions



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Hello,
 
By design duplicate quotes are not allowed/possible in AB 
database.
If you import again the same quote it will overwrite previous 
one.
 
Only incorrectly written plugin can theoretically create 
duplicates.
 
Best regards,Tomasz Janeczkoamibroker.com
<BLOCKQUOTE 
>
  ----- Original Message ----- 
  <DIV 
  >From: 
  <A title=uenal.mutlu@xxxxxxxxxxx 
  href="">uenal.mutlu@xxxxxxxxxxx 
  To: <A title=amibroker@xxxxxxxxxxxxxxx 
  href="">amibroker@xxxxxxxxxxxxxxx 
  Sent: Sunday, April 27, 2003 7:39 
PM
  Subject: Re: [amibroker] Database purify 
  tool - short instructions
  
  Hi Tomasz,
  it would be nice if also possible duplicate quotes 
  (duplicate dates)
  could be detected. I once had MSFT having such dupes; 
  don't know 
  how this was produced.
  UM
   
  <BLOCKQUOTE 
  >
    ----- Original Message ----- 
    <DIV 
    >From: 
    Tomasz Janeczko 
    
    To: <A title=amibroker@xxxxxxxxxxxxxxx 
    href="">amibroker@xxxxxxxxxxxxxxx 
    Sent: Sunday, April 27, 2003 6:46 
    PM
    Subject: [amibroker] Database purify 
    tool - short instructions
    
    Hello,
     
    A new database purify tool is provided to 
    detect
    all kinds of data errors including:
    missing quotes, extra quotes, invalid OHLC,
    unadjusted splits.
     
    The tool is available from Tools->Database 
    Purify
    and it looks as follows:
     
    <SPAN 
    ><IMG 
    height=497 src="jpg00123.jpg" width=514 
    v:shapes="_x0000_i1025">
    <SPAN 
    ><FONT 
    face=Tahoma size=2> 
    <SPAN 
    ><FONT 
    face=Tahoma size=2>THE DESCRIPTION OF 
    CONTROLS:
    <SPAN 
    ><FONT 
    face=Tahoma size=2> 
    
      <SPAN 
      ><FONT 
      face=Tahoma size=2>Reference symbolthis is a ticker 
      symbol that should be used as reference for missing/extra quote detection. 
      Usually this should be set to the INDEX or other instrument that is (more 
      or less) guaranteed to be traded every trading day (without 
      holes)Purify tool will use this symbol data to check if other symbols 
      are traded on the same days as the reference symbol 
      <SPAN 
      ><FONT 
      face=Tahoma size=2>Apply to: All symbols/ Current/ 
      FilterAllows to control if check should be performed on all 
      symbols in the database or just currently selected symbol or some symbols 
      matching custom category filter (definable via Filter... 
      button) 
      <SPAN 
      ><FONT 
      face=Tahoma size=2>Quotes: All / Last n= Decides if 
      report should cover all available quotes or just last n quotes (n is 
      user-definable). The value of n refers to last n quotes in Reference 
      symbol. 
      <SPAN 
      ><FONT 
      face=Tahoma size=2>Report invalid OHLC 
      relationshipwhen checked, purify tool will report bars in 
      which the relationship between Open, High, Low, Close fields is invalid. 
      The following cases are reported Open > High, Close > High, Open 
      < Low, Close < Low, Low > High. ON by default. 
      <SPAN 
      ><FONT 
      face=Tahoma size=2>Report missing quoteswhen checked, 
      purify tool will report quotes that are present in Reference symbol but 
      are NOT present in symbol being checked. ON by default. 
      <SPAN 
      ><FONT 
      face=Tahoma size=2>Report missing quotes at the beginning (shorter 
      history than reference symbol)when checked, purify tool will 
      report symbols that have shorter history than reference symbol. It will 
      list all quotes at the beginning of the history of the reference symbol 
      that do not have matching quote in symbol being checked. This is 
      quite usual that indices have longer history than most symbols therefore 
      this option should be used sparingly because this is not really 
      a problem if history of given symbol starts later than reference 
      symbol. OFF by default. 
      <SPAN 
      ><FONT 
      face=Tahoma>Report possible 
      splits when checked, purify tool will scan quotes for 
      previous close - current open gaps exceeding +/- Detection 
      threshold percentage change. If such gap is detected it will 
      'estimate' possible split factor and report given day as possible 
      unadjusted split date. 
      <SPAN 
      ><FONT 
      face=Tahoma size=2>Report extra quoteswhen checked, 
      purify tool will report quotes that are present in symbol being currently 
      checked but are NOT present in reference symbol. If you get a lot of 
      'extra quote' entries it may mean that the reference symbol you have 
      choosen does not trade each trading day.
    WHAT YOU CAN DO WITH THE RESULT 
    LIST?
     
    After choosing appropriate options you can run scan for 
    possible data problems using "Analyse" button.
    At any time you can abort the scan using "Cancel" button 
    in the progress window.
     
    One scan is completed (or aborted) you can review the 
    result list and then you can click right mouse button
    over the result list and choose one of the following 
    options:
    
      add symbols to watch list 
      add selected symbols to watch listthese options 
      will add either all or selected items to the watch list of your choice. 
      You will be able to delete symbolsusing Symbol->Organize 
      assignments. 
      Copy to clipboardwill copy the contents of result 
      list to the clipboard for further use in any other application
    You can also double click on any entry to show given chart with 
    selection line showing inappropriate entry (with exception
    to missing quotes of course)
     
    Best regards,Tomasz 
    Janeczkoamibroker.com
     Send 
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