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AFL to find wrong Data
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Created: by Jacare Attachments:0

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AFL to find wrong Data

  #1 (permalink)
Trading Apprentice
Munich Germany
 
Futures Experience: Intermediate
Platform: Amibroker
Broker/Data: Plus500, CMC, etx
Favorite Futures: CFD
 
Posts: 10 since Jan 2014
Thanks: 1 given, 2 received

AFL to find wrong Data

Hi all,

I use Yahoo Finance as quote provider and there are a lot of wrong quotes. For example, a stock that has its price $5, next day price $120 and the next day $5 again. It is like a gap, but with a big %Change. Could someone help me with the code? I try this one, but it doesn't work:


Buy = L > ((Ref(C, -1)*2);
Sell = H < ((Ref(C, -1)*2);

Filter = (Buy OR Sell)

AddTextColumn( FullName(), "Name",100, colorDefault,colorDefault,300);
AddTextColumn( WriteIf( Buy, "Buy", "Sell" ), "Signal", 50, colorDefault,colorDefault, 50 );

SetSortColumns( 4,-5) ;



I would appreciate any kind of help.

Thanks,

Jaca

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  #2 (permalink)
Trading Apprentice
Asheville, North Carolina
 
Futures Experience: Advanced
Platform: AmiBroker, Dynamic Trader, Metastock, FreeStockCharts, TradingView
Favorite Futures: stocks, options
 
Posts: 24 since Sep 2010
Thanks: 1 given, 15 received

You might try downloading again as Yahoo often corrects data (or rather their data supplier catches the problem and corrects) and this is particularly true for historical data rather than Daily. To see if there is a more fundamental problem with the data always double check the data against other sources such as StockCharts.com or TradingView.com.

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  #3 (permalink)
Trading Apprentice
Munich Germany
 
Futures Experience: Intermediate
Platform: Amibroker
Broker/Data: Plus500, CMC, etx
Favorite Futures: CFD
 
Posts: 10 since Jan 2014
Thanks: 1 given, 2 received


Thanks for the answer, but I am looking for an AFL that can find this errors. I checked again and i.e. AGL is still wrong.

Could someone help me with the formula?

Thanks,

Jacare

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  #4 (permalink)
Trading Apprentice
Asheville, North Carolina
 
Futures Experience: Advanced
Platform: AmiBroker, Dynamic Trader, Metastock, FreeStockCharts, TradingView
Favorite Futures: stocks, options
 
Posts: 24 since Sep 2010
Thanks: 1 given, 15 received

Some questions and "to dos":

1 - Give us a couple of examples - which symbols and dates and timeframe (daily/historical). Are all of the errors like 5-120-5? Are you by chance looking at a split or dividend and your downloader is not compensating? What downloader are you using? Is the data OK on the website?
2 - Run your data through database purify. Does that solve the problem?
3 - If 2 is not adequate define what conditions you want to search for? Your code will not do the job. You will have to define conditions for O, H, L, C independently as any of these can be off.

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