Hi Vernon,
I suppose the fast answer is "It depends". On what
does it depend? Well really how are you using the data and for what
stocks.
First of all, Yahoo data is WYSIWYG, i.e. it doesn't
adjust for splits, symbol changes, etc. So if your principal use is to
acquire a historic database to back test against, do so with extreme
caution. If you are planning on maintaining a large number of symbols to
track on a day to day basis to make EOD trading decisions for trades the next
day, again the caveat "be careful and double check with another data source
before placing trades" (you broker's data is probably sufficient
here). If you are going to follow only a few (say 50 or fewer) stocks,
then it may be fine. Why? Well as I said, Yahoo data is WYSIWYG and
you will have to do all the adjustments for splits, symbol changes, etc. which
means spending some amount of time tracking down that info in press releases,
SEC filings, etc. On a large database this quickly becomes very time
consuming. Your time is a resource and is better spent trading,
preparing to trade, learning to trade, studying the markets, etc.
Thus, if you are really trading (or even investing by
buying and selling more than a couple dozen times a year), you are better off
spending the nominal amount to buy a data service that will maintain all that
stuff for you and do so with reliable accuracy. Quotes Plus, TeleChart
2007, Premium Data from Norgate are all reasonably priced EoD data providers
(think like a couple lattes a week) which integrate with AB nearly
seamlessly. Another route to go is feed you
broker's data to QuoteTracker and then import it into AB. This won't give
you an instant lengthy historical database, but again depending on the number of
stocks you plan to follow can be manageable. Keep in mind also that
your costs for data feeds (like investment subscriptions and AB) is a tax
deductible expense incurred to generate income.
If you do decide to go cheap (remember the
adage "you get what you pay for" seems to have been invented for data
feeds) and stay with free Yahoo data, pay close attention to daily highs and
lows as well as open and closing prices and volume. Often there isn't too
great a difference, but if you are using indicators which are based on these
data points, be wary.
Peace and Justice ---
Patrick
----- Original Message -----
Sent: Monday, March 08, 2010 4:30
PM
Subject: Re: [amibroker] Few Newbie
Questions re: yahoo data
Hi -
Like wise, I am a "newbee" to all this. I had no
intentions of becoming a programer, but I do like Amibroker. While I'm
learning (and losing money <kidding>), I am using yahoo EOD data during
my learning process. It appears to agree with my Scottrade Account
(although I haven't done any investigation into the accuracy). I have no
desire to use RT data - EOD is fine for my uses.
Could
someone expand or provide more information with regard to the statement
below of "yahoo EOD data being inaccurate"? That worries me a
little since I'm investing my hard earned $$$$ using
it. Thanks in advance for any insite/information you
might provide.
As to when EOD data can be downloaded, I generally
d/l it between 6 and 7 pm ET. If "historical" d/l doesn't pick it up,
"current day" will.
Vernon
--
ENJOY LIFE!! Keep it SIMPLE!!
Hi Jchi --
High quality, low cost end-of-day data is available
from several vendors. Two I recommend (I subscribe to them both)
are:
Quotes Plus -- http://qp2.com/joomla/index.php
Norgate
Premium Data -- http://www.premiumdata.net/
Read
the reference materials related to BuyPrice, SellPrice, and
TradeDelays. They work in combination.
The pair of
statements
BuyPrice = Open;
SetTradeDelays(0,x,x,x);
uses the
price of the open of the bar being processed.
The pair of
statements
BuyPrice = Open;
SetTradeDelays(1,x,x,x);
uses the
price of the open of the bar following the bar being
processed.
Thanks,
Howard
On Fri, Feb 26, 2010 at 3:58 PM, jchi18 <inbox.chi@xxxxxxcom>
wrote:
1. When is the earliest I can download EOD data from Yahoo? i.e., when
will today's data be available for download?
2. In the trades tab
when performing automatic analysis, what does buy price mean if I set it
to open? i.e., I perform a scan of my trading system and it says that a
buy signal was found for 2/26/10. When it is set to buy at the open price,
will amibroker get the open price of 2/26 or 2/27?
3. What is the
best but reasonably priced way of getting accurate EOD data into
amibroker? I understand that Yahoo is inaccurate.
Feel free to
contact me at inbox.chi@xxxxxxcom. THanks.
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