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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 -----
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 -----
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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