With a "little" work you can do this yourself by writing
a script that you run before you update from QP. The script would export all
tickers in your current QP db to csv's and then it would import them into a
separate stand alone db that you would use to test.
A lot of work if you try to do it manually but if you
write that scipt and make it a wrapper for the QP downloader then it would be
"automatic".
d
Gary from QP replied to my question and he
says.
"We don't keep dead symbols, they will be
purged more frequently that in the past, as the dead symbols cause problems
for others."
I guess if QP does not keep dead symbols then automatically they are
emptied out. In Amibroker the symbol is still there but there is no data. I
don't think there is a setting in Amibroker that allows you to keep them in
the data base. For portfolio backtesting this is a bad thing in my opinion.
These dead symbols used to stay in the database for a long time which I
liked since it gives a good idea how a portfolio type system would have
performed in the past. Now you only see survivers and companies that
have eaten up others.
I remember that there is an EOD data service that keeps dead
symbols in the database. Which one? Anyone know?
rgds, Ed
----- Original Message -----
Sent: Monday, May 28, 2007 9:39
AM
Subject: Re: [amibroker] Are old
symbols saved in local data base?
hi,
I am struggling with this myself. It seems
that discontinued symbols are automatically emptied out. When I calculate
my backtest for monday I get a diiferent result with respect to friday
because a few symbols that were giving signals are removed (HCA, CMVT,
maybe others, who knows ...). It would be nice if these symbols would
remain in the database with the data still there. Now we are just
left with an empty symbol. Not sure if this is due to QP or Amibroker, or
if we can set something so they will remain in the database.
rgds, Ed
----- Original Message -----
Sent: Sunday, May 27, 2007 10:02
PM
Subject: [amibroker] Are old
symbols saved in local data base?
I'm using the QP database. If it is configured to use "Local data
storage", are old symbols along with their Market, Group, etc.
memberships saved in the local database after I do a Configure to
add
new symbols, or are discontinued symbols deleted from the local
database?