Barry, 

See what TJ wrote on 
http://www.amibroker.com/kb/2007/08/04/amiquote-and-free-data-from-yahoo/

As Brian noted, it's obvious (although TJ didn't write that) that OHL 
and V are also adjusted - otherwise the data wouldn't fit.

Greetings, 
Thomas

> What does AB do when it gets data from Yahoo? I periodically load
> historical data to make sure my database has been updated to include
> splits and dividends.
>
> I am trying to update a spreadsheet to use the updated data that
> includes the dividends. I wrote an AFL program to dump the open on
> the trade date. I saw that the field values were quite different than
> the value when I actually traded it.
>
> My question is when getting historical data from Yahoo, what does AB
> or AQ do when it sees an adjusted close? Does AB change all fields,
> the OHLC, by a proportion of delta or does it just change the close
> value?
>
> Thanks,
> Barry

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