Graham>>I see absolutely no reason to only
hold 260 bars in a database.
Ron D.>>I will start running my actual
Trading Explorations from this 6 Month database
Graham,or Paul,Please correct me if
I interpreting thos incorrectly.
=================================
My TRADING EXPLORATION looks back only 20 days,
and I got the impression from one of our Local Amibroker guru's that a
shorter database will run faster, and that is why he runs his
TRADING EXPLORATIONS from a shorter database than he uses for
BACKTESTING.
My US_Stocks folder is LOCAL, and Paul
Ho has cited the user manual which
indicates that NUMBER OF BARS TO LOAD will have no effect in my case, and
that a PROGRAMMER would need to write a script or com object to
accomplish what I want to do.
Ideally, I would like to have something that
automatically eliminates each day of data that becomes older than 6 months
right after I finish a new daily YahooCurrent download from
Yahoo.
I am definately NOT A PROGRAMMER, so if such
a script already exists, I would appreciate hearing where it is, and if it
doesn't exist, maybe an Amibroker user would like to creat it. Thanks Paul
and Graham for your help.
Ron D.
----- Original Message -----
Sent: Thursday, April 06, 2006 10:26
PM
Subject: RE: [amibroker] USstocks
DATABASE
From the user's guide
Number of bars to load - defines how many bars should be loaded
from external data source and kept in AmiBroker. Examples: 10-years
EOD: 2600, 60-days intraday 1-minute: 30000 (approx). This setting has no effect
if data source is set to (local).
You if your database
is local. then you need to write scripts or use com objects in your afl
to delete data from the database, its possible
though.
I see absolutely no reason to only hold 260 bars in a database.
In
bcktesting you specify the period of the test so it makes
no
difference if you ahve 1 year or 100 years, you only test over
what
you want. There could even be a problem only having a short
database
history as some methods are compiled over the histlry and a short
one
could provide very different results.
Also if you use for example
EMA(H,50) in your conditions then you have
immediately lost 20% of your
history as it requires 50 bars to
start
results
--
Cheers
Graham
AB-Write ><
Professional AFL Writing Service
Yes, I write AFL code to your
requirements
http://e-wire.net.au/~eb_kavan/ab_write.htm
On
4/7/06, mrdavis9 <mrdavis9@xxxxxxxxxx> wrote:
> Thanks
Graham. I set the bars to 260 which Amibroker says is about
a
> year's worth of data.
>
> If this really does make
Amibroker totally ignore all the rest of the data,
> then why does one
of our local computer guru Amibroker users keep a separate
> short
database for trading purposes, and he uses a longer database for
>
backtesting.
>
> Is it possibly because he finds it easier
to not have to keep changing the
> BARS TO LOAD setting. Ron
D
>
> ===================================================
>
----- Original Message -----
> From: "Graham"
<kavemanperth@xxxxxxxxx>
> To:
<amibroker@xxxxxxxxxxxxxxx>
> Sent: Thursday, April 06, 2006 12:52
AM
> Subject: Re: [amibroker] USstocks DATABASE
>
>
>
> You could just make the Database settings, Bars to load to be 126
or
> > similar for 6 months of data.
> >
> >
--
> > Cheers
> > Graham
> > AB-Write ><
Professional AFL Writing Service
> > Yes, I write AFL code to your
requirements
> > http://e-wire.net.au/~eb_kavan/ab_write.htm
>
>
> >
> >
> > On 4/6/06, mrdavis9
<mrdavis9@xxxxxxxxxx> wrote:
> >>
> >> I am
using the FREE EOD data from Yahoo.
> >> My Yahoo US_stocks
database goes all the way back to 10/01/1928.
> >>
>
>> I copied all of this US_stocks database into a new
folder which I
> >> have
> >> named
US_stocks_6Months.
> >>
> >> I will start running my
actual Trading Explorations from this 6Month
> >> database as soon
as I can learn how to eliminate all of the DATA that is
> >>
older than 6 months. Right now, it still has all of the data back
to
> >> 1928.
> >>
> >> Ideally, I would
like to have something that automatically eliminates the
> >> one
day of data that becomes older than 6 months right after I finish a
>
>> new
> >> daily YahooCurrent download from Yahoo.
>
>>
> >> Hopefully, someone will be able to show me how I can
accomplish this.
> >> Ron D
> >>
> >>
Please note that this group is for discussion between users only.
>
>>
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>>
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also:
> >> http://www.amibroker.com/support.html
>
>>
> >>
> >>
> >>
> >>
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