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Data quality generally seems to be of little concern to data providers and
software vendors alike. The first trading software I ever wrote some 15 years
ago was a data filter program to clean/filter EOD data. It does simple things
like checking for 30% gaps on relatively low volume to catch unreported splits
and bad prices, checking for volume which is extremely high with relatively
little price movement, and checking for ohlc relationships which are improbable.
Both Equis and Omega downloaders seem to see fit to post whatever garbage comes
in although the latest versions of Metastock do provide a report of probable
errors. In course of notifying Dial Data of some data errors recently, I asked
them why they don't use simple filters to catch this stuff before it goes out. I
included the logic for the filters I use. They thanked me for notifying them of
the errors and ignored my question. I'm not singling out DD as I've found the
same thing with the half-dozen plus major EOD vendors I've used over the years.
Finally, I can't understand why, when I do see bad data on my charts, I've got
to load another piece of software to fix the data instead of clicking on the bad
bar and entering the fixes.
Earl
-----Original Message-----
From: Tom Cathey <K1JJ@xxxxxxx>
To: omega-list@xxxxxxxxxx <omega-list@xxxxxxxxxx>
Date: Tuesday, March 24, 1998 4:39 PM
Subject: Those Nasty New York Commodity Markets
>I just cannot understand it! After all these years you'd think they would
>put in a little software routine to catch a ridiculously "off the wall" bad
>tick as it comes out of the pit.
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