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Tomasz,
> It is not reflected in the global "From" date (which is in fact set
>from first symbol),
So what is the function of the global "From" date now?
brian_z
--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx>
wrote:
>
> When using auto-update tool, AmiQuote asks AmiBroker for last date
for each symbol separately.
> It is not reflected in the global "From" date (which is in fact set
from first symbol), but it is handled internally
> so each symbol downloads from its own "last" date.
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message -----
> From: wavemechanic
> To: amibroker@xxxxxxxxxxxxxxx
> Sent: Sunday, March 16, 2008 1:42 PM
> Subject: Re: [amibroker] Re: quote download?
>
>
> With respect to the update process, I don't use AQ at this time,
but when I did I do not recall any problem with different symbols
having different last dates (not holes in data) for auto update. My
impression was that AQ gets the earliest last available date for the
entire symbol list (I suspect this would be easier and faster than
keeping track of individual ending dates) and then gets historical
data from that date forward for all symbols. As I recall, there was
never a problem with getting all data when different symbols had
different ending dates (can occur for a number of reasons) which is
consistent with the earliest last date scenario. If one is
interested, this could easily be checked by creating a small dummy
database containing all data through the current date, delete a
different number of quotes from different symbols, and then run auto
update to see if all symbols are updated properly through the current
date. I have used a number of downloaders through the years and this
is the way they seem to function which makes correcting data for
distributions, etc. relatively easy.
>
> Bill
>
> ----- Original Message -----
> From: "brian_z111" <brian_z111@xxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Saturday, March 15, 2008 10:36 PM
> Subject: [amibroker] Re: quote download?
>
>
> snip
>
> >
> > In this case Tomasz chose to use the end date of the first
symbol as
> > the default start date for auto download i.e. it is an updater
and
> > assumes we start with clean data, have an index as the first
symbol
> > (indexes will always trade) and that we constantly update (keep
> > building the database).
> >
>
> snip
>
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