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If you want to use Worden and get the odd index from Yahoo then jsut
try the reverse of what I suggested i.e. make a spare database and
ASCII import your Yahoo index into it.
You can easily get an ASCII file for a single Yahoo index or symbol -
just use AQ to download but do not check auto import .... look in the
AmiQuote folder for the file of the symbol you just downloaded ... it
is already in ASCII compliant format.... then import that data into
your Worden/AB database.
Trust me.
AB is very forgiving (thanks Tomasz).
I have tried things like, changing a RT database, compiled using a
plugin, into a static local database by changing the database
settings to local.
I am pretty certain you could change from, say Worden EOD to
Metastock plugin as the source as long as your database is EOD and
locally enabled (as I said - just experiment to find out).
--- In amibroker@xxxxxxxxxxxxxxx, "brian_z111" <brian_z111@xxx> wrote:
>
> Hello John,
>
> I don't use Worden so I can't run a test but theoretically I think
you
> can do it.
>
> AB can be treated as any database and it is robust, especially for
EOD
> databases (mixing EOD and intraday is not such a great idea IMO).
> Often experiment is the best answer.... as long as you backup your
good
> database and play around with a spare.
>
> AmiQuote/Yahoo
>
> Yes the history is deep ...it varies with symbol ... I have 10
> years ... some went a lot further.
>
> The problem might be matching the data type.
> Worden has subjectively adjusted data?
> Yahoo has either div and event adjusted OR raw data (your choice).
>
> Yahoo does contain some errors so it will not deliver pin point
> accuracy for algorithmic trading e.g. I have seen a 50 cent div
entered
> into Yahoo as 50 dollars.
>
> Yahoo Raw is more likely to be accurate since Yahoo do the
adjusting
> themselves while the raw data comes straight from CSI.
>
> IF you are going to use Yahoo then you do need to learn the tricks
of
> the trade (price adj and volume adj).
>
>
> There might be more than one way to do it.
>
> Try this to start.
>
> Export your Valueline index ASCII file.
> Start a new local EOD database.
> ASCII import your Valueline index to the new database.
> Get a list of Yahoo symbols for the stocks you are interested in,
enter
> them to your new database and AmiQuote/Yahoo data for them.
>
> Pretty certain you could also append Yahoo data to a Worden sourced
AB
> database as long as it is EOD ... the only prob would be any
symbols
> that don't correspond, which is usually only the indexes.
>
> brian_z
>
>
>
>
>
> --- In amibroker@xxxxxxxxxxxxxxx, "john10987654321"
> <john10987654321@> wrote:
> >
> > I am using Amibroker with the Telechart plugin. Recently Worden
> > stopped including the Value Line Geometric Index symbol in its
list of
> > items. I want to backtest a strategy based on the performance of
this
> > index. Is there a way to import historical prices going back,
say, 15
> > years, into Amibroker from Yahoo while still using the Telechart
> > plugin for all my stock symbols. I see that Amiquote can be used
for
> > EOD data, but is that just for the most recent past or just
today's
> > data? Any suggestions much appreciated.
> >
>
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