----- Original Message -----
Sent: Thursday, January 05, 2006 7:09
PM
Subject: [amibroker] Database Cleanup
Script - need three testers
Hi,
One of the issues that we deal with is bad data from vendors. I
use QP3. I like it and think that they provide a good product
for the price. However, some of their data is not as clean as I'd
like.
To resolve this, I took Tomasz's "Cleanup.js" Jscript and expanded
it. It does a fair amount (see below) and improves the quality
of my data. Although I use QP3 for data, the script is NOT
specific to a particular data source. Since it operates only on the AB
database, it should work with any data source or vendor.
This script is NOT and will NOT be for sale, but I'm willing to share
it with this group IF three people will step forward and be willing to test
it. (Since it deletes symbols, it has to be clean.) Note
that I do NOT want you to test it on a live AB database, only a test AB
database.
Any takers?
Regards,
Dan.
----
What it does:
- Deletes Groups of symbols for GroupIDs that you specify (e.g.,
Preferred Stocks", Mutual Funds, etc.)
- Deletes symbols with no quotes or stale (never changing)
quotes.
- Deletes specific symbols (from an "AlwaysDelete" text file list) that
you know are bad or do not want. This is an override list.
- Never deletes specific symbols (from a "AlwaysKeep" text file
list) that you always want to keep - EVEN IF they have no quotes or
are in a "Delete" group. I.e., this is an override list.
- Keeps logs of the overall runs, deleted symbols, deleted no-quotes
symbols, etc.
In my case, I don't want a lot of unused or bad symbols clutering up my
database. I am not interested in the thousands of Mutual
Funds, Preferred Stocks, Unit, and some other non-stock symbols.
But, I am interested in a handful of Mutual fund symbols (about 30-40),
stocks, ETFs and some Indexes.
My script deletes all symbols which meet certain criteria, including
certain groups. So all Mutual Fund (a Group) symbols are deleted
UNLESS they are in the "Always Keep" list. OTOH, QP contains some old,
unused symbols like the "LE**" symbols which are NOT in a "Delete" Group but
I still want to delete them. These are listed in the "Always Delete"
list.
Before testing it this morning, I downloaded 29,000 symbols from
QP into an AB test database. This included Stocks, Indexes,
Sector/Industry assignments and Mutual Funds. After running the
script, 21,000 were deleted.