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Having never found a problem using mixed mode for eSignal data, I'm
intrigued by your "[it] just doesn't seem to be the right method of storing
the data permanently."
Bob
-----Original Message-----
From: amibroker@xxxxxxxxxxxxxxx [mailto:amibroker@xxxxxxxxxxxxxxx]On
Behalf Of Lesmond V
Sent: Sunday, April 24, 2005 11:43 AM
To: amibroker@xxxxxxxxxxxxxxx
Subject: [amibroker] EOD and Intraday Data In The Same Database
Tomasz,
I absolutely agree with almost everything you said. AB is obviously
far superior to both QCharts and SierraChart.
The only problem I see with AB is its inability to store separate eod
and intraday data files for the same symbol in the same database.
Mixed mode (both eod and intraday data in the same file) is an
interesting feature and it's nice to have it but I to me it looks
like an emergency solution. This just doesn't seem to be the right
method of storing the data permanently.
The proper way seems to be to have two separate data files for the
same symbol: one with eod data and one with intraday data, and,
ideally, both files should be in the same database, which is
currently not possible with AB. As a result, if you don't want to use
"mixed eod/intraday mode" you have to run two separate instances of
AB, one for eod and one for intraday charts.
This is the only area where SierraChart is superior to AB. In Sierra
eod files have different extension than intraday files so all the
files can be stored in the same database.
Lesmond
---------------------------
Message #81122 from Lesmond
Re: Potential Amibroker Buyer rapidly losing interest
As a new user of AB and long time user of other charting packages I
find the whole issue of mixing EOD and intraday data in one file or
suggestions to run two separate instances of AB (one for EOD charts
and one for intraday ones) confusing at best.
In SierraChart eod files have extension DLY and intraday files have
extension MND and all those files (with exactly the same file=symbol
names) are stored together in the same folder and then pull-up for
charting from within the same database using separate eod/intraday
menus. This file structure is easy to manage and very flexible.
In QCharts you can pull an eod chart and then in the next window 5min
chart for exactly the same symbol.
Lesmond
-----------------------------------
Message #81127 from Tomasz Janeczko
" In QCharts you can pull an eod chart and then in the next window
5min chart for exactly the same symbol".
You can do exactly the same in AmiBroker. You can also backtest
different intervals and even switch intervals inside one formula
(TimeFrame functions). AB is simply superior to anything you
mentioned.
Using mixed EOD/intraday mode you have both intraday and eod
histories available at the same time. So no product you mentioned
provides anything more than AB. In fact they are inferior when it
comes to handling huge eod databases.
Tomasz Janeczko
-----------------------------------
Message #81126 from Tomasz Janeczko
As you know well, QCharts is
a) hard-wired to one data source (quote.com)
b) does not store data locally at all (all data are constantly
downloaded from internet)
c) does not even have 20% of features as AmiBroker (no "automatic
analysis" at all)
For this reason the solution they use (i.e. not storing data locally
at all and downloading everything constantly from the web) is
suitable for them.
It is unfortunatelly completely unsuitable for application like
AmiBroker that needs local database to make quick backtesting/
explorations possible.
The same appplies to SierraChart - this product is focused on
charting, not on data mining / analysis / backtesting.
AmiBroker is mainly analysis / backtesting platform that is optimized
to perform huge data mining (ten thousands of symbols and very long
histories). Such work is completely beyond capabilities of QCharts/
SierraChart.
AmiBroker with its file structure having ability to store tens of
thousands of files and plugin architecture allowing linking to ANY
data source is far superior to those products because it provides
flexibility and speed not available anywhere else. This includes
ability to use Quote.com as real-time data source (plus of course
many others).
Try using the products you mentioned on database that holds 60000
symbols (like QP2 for example) and make any analysis and you will
start to understand why AB is superior.
No other product is able to work at huge EOD database and on
real-time intraday databases at the same time maintaining speed and
flexibility.
Tomasz Janeczko
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