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It was my understanding that if you set (for local database only) your
database settings - bars to load to 260, then AB woud only store 260
bars, or alternatively only load 260 bars into memory
I fell foul of this with my intraday database and lost a lot of data
because I had too few bars in the setting thinking it would store the
data and only load the set number of bars.
--
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:
>
> 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 -----
> From: Paul Ho
> To: amibroker@xxxxxxxxxxxxxxx
> 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.
>
>
> ________________________________
> From: amibroker@xxxxxxxxxxxxxxx [mailto:amibroker@xxxxxxxxxxxxxxx] On Behalf
> Of Graham
> Sent: Friday, 7 April 2006 8:23 AM
> To: amibroker@xxxxxxxxxxxxxxx
> Subject: Re: [amibroker] USstocks DATABASE
>
> 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.
> > >>
> > >> To get support from AmiBroker please send an e-mail directly to
> > >> SUPPORT {at} amibroker.com
> > >>
> > >> For other support material please check also:
> > >> http://www.amibroker.com/support.html
> > >>
> > >>
> > >>
> > >>
> > >> ________________________________
> > >> YAHOO! GROUPS LINKS
> > >>
> > >> Visit your group "amibroker" on the web.
> > >>
> > >> To unsubscribe from this group, send an email to:
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> > >>
> > >> Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
> > >> To unsubscribe from this group, send an email to:
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> > >>
> > >> Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
> > >> Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
> > >> ________________________________
> > >>
> > >
> > >
> > >
> > > Please note that this group is for discussion between users only.
> > >
> > > To get support from AmiBroker please send an e-mail directly to
> > > SUPPORT {at} amibroker.com
> > >
> > > For other support material please check also:
> > > http://www.amibroker.com/support.html
> > >
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> >
> >
> >
> > Please note that this group is for discussion between users only.
> >
> > To get support from AmiBroker please send an e-mail directly to
> > SUPPORT {at} amibroker.com
> >
> > For other support material please check also:
> > http://www.amibroker.com/support.html
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
>
>
> Please note that this group is for discussion between users only.
>
> To get support from AmiBroker please send an e-mail directly to
> SUPPORT {at} amibroker.com
>
> For other support material please check also:
> http://www.amibroker.com/support.html
>
>
>
>
> ________________________________
> YAHOO! GROUPS LINKS
>
> Visit your group "amibroker" on the web.
>
> To unsubscribe from this group, send an email to:
> amibroker-unsubscribe@xxxxxxxxxxxxxxx
>
> Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
> To unsubscribe from this group, send an email to:
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>
> Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
> Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
> ________________________________
>
Please note that this group is for discussion between users only.
To get support from AmiBroker please send an e-mail directly to
SUPPORT {at} amibroker.com
For other support material please check also:
http://www.amibroker.com/support.html
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