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Volker,
All I'm saying is that even "blue chips" have had numerous occassions to
close 20% or more above or below previous close.
I'd rather expect this from junk stocks or growth etc.
According to Yahoo, just about every stock from Dow 30 is affected.
It's not very frequent. Every other few years or so. Just enough to inflict
damage on system testing, just like testing on futures continuous unadjusted
data. Any optimization would of course pick those sudden changes and attempt
trading them.
But hey, maybe moves of this magnitude are quite normal? I wouldn't know,
for I've been trading index futures all my trading life.
In fact I had hoped to look specifically into blue chips (diversification,
etc) assuming they would share some characteristics with indices, price-wise
(no sudden jumps, volatility, ATR and StDev in line, no unexpected slippage,
etc.) I can be mistaken here. Like I said, I'm new to stocks.
Best regards
Yarroll
***
http://republika.pl/yarroll999/
----- Original Message -----
From: VK <volker@xxxxxxxxxxxxxx>
To: 'Yarroll' <komin@xxxxxxxxxxxxxx>; <omega-list@xxxxxxxxxx>
Sent: Friday, October 10, 2003 11:14 AM
Subject: AW: Yahoo, data, etc.
> Yaroll.
> Actually I am quite happy with the quality of the Yahoo data (US). On
> top of that I can key in the symbol from nearly any exchange in the
> world and get the historical data. Or I download the whole history of a
> full portfolio at once and get it updated every day. No other data
> vendor offers that!
> With Yahoo you can also get RT price update for free. This is quite
> handy if you have 50 stops to follow and want to know which one is
> closest to your stop.
> http://www.wealth-lab.de/cgi-bin/WealthLab.DLL/getpage?page=QM-Screensho
> t.htm
>
> vk
>
> ||-----Ursprüngliche Nachricht-----
> ||Von: Yarroll [mailto:komin@xxxxxxxxxxxxxx]
> ||Gesendet: Donnerstag, 9. Oktober 2003 20:40
> ||An: omega-list@xxxxxxxxxx
> ||Betreff: Yahoo, data, etc.
> ||
> ||Hello,
> ||
> ||Is there a free and more-or-less reliable source of EOD data on US
> stocks?
> ||Nothing fancy, just Dow 30, Nasdaq 100.
> ||
> ||I downloaded the Yahoo data and converted to Metastock format, then
> ||checked
> ||it for consistency. I had hoped at least blue chips would be fine, but
> the
> ||fact is, there's not one stock without errors. Most frequent is Error
> 1091
> ||(Large change in close, that's when the stock closes 20% or more off
> the
> ||previous close). I guess most of this is due to splits, but surely not
> ||all.
> ||Information on splits probably is there somewhere, but it's still a
> pain
> ||to
> ||go back in some cases 30 years back to adjust it all for +100 stocks.
> ||
> ||What do you think? I concluded Yahoo is a total mess. Maybe someone
> would
> ||help out? I feel I'm the last Mohican to be interested in plain old
> stocks
> ||:-)) Or please advise where to find EOD, split-adjusted data on
> stocks.
> ||No
> ||need for updates, or recent data, for it's needed for historical
> ||backtesting
> ||only. Maybe even without Nasdaq 100, for I think just about all of
> these
> ||had
> ||gone through this "startup company" phase relatively recently (in
> years)
> ||while the Dow 30 had been around for a while (well, established
> something
> ||like a decade or two, etc.) I'm not at all sure if startup companies
> can
> ||be
> ||tested in the same category as blue chips (these latter shouldnt have
> ||these
> ||jumps in for example ATR or StDev).
> ||
> ||Thanks. Best regards
> ||
> ||Yarroll
> ||
> ||
>
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