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?