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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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