Hi Bill,
I suppose you are right, however if one is updating
daily with the current day feed (much faster and available earlier than
historical) the data is not adjusted. You either have to do that chore
yourself, or periodically (weekly??) re-download your entire symbol list from
the historical site, which I am assuming will overwrite the non split adjusted
info. While it is possible to write an exploration to spot possible split
candidates (based on price changes between days), one still needs to verify the
split and the ratio. For me, my time is worth more than the $1 to $2 daily
for data versus my effort to keep a sizable databases current.
But that still doesn't solve the symbol change and new
symbols problem. Today, for example, BALT (Baltic Trading, Inc., a marine
shipper) started trading. If you happened to watch for new listings then
you might know of it. If not, then it may be some time before you happen
to learn about it. IPOs are often good to watch when they first start out. A
data service will automatically pick it up and add it and you can refresh you AB
database to add it.
However if you only trade a few symbols, then Yahoo
certainly can answer the need.
Peace and Justice --- Patrick
----- Original Message -----
Sent: Wednesday, March 10, 2010 11:36
AM
Subject: Re: [amibroker] Few Newbie
Questions re: yahoo data
Yahoo does provide adjusted split/dividend data for
their "historical" data. So, if downloading historical the downloader
should be able to handle this adjustment to the
database.
Bill
----- Original Message -----
Sent: March 09, 2010 2:20 AM
Subject: Re: [amibroker] Few Newbie
Questions re: yahoo data
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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