|
PureBytes Links
Trading Reference Links
|
Hello Tom,
1. It could be argued both ways if price should or should not be
adjusted for dividends. From the technical analysis point of
view this can cause small distortions in indicators and may
affect your trading system results if dividends are large.
But in most cases (especially growth stocks) dividends do
not play that big part in price
2. There are several ways to overcome this problem:
a) you can adjust prices backwards if you know the dates and
dividend values (you can even automate this process using
custom written JScript)
b) you can use other data source (free quotes are available for
example from www.downloadquotes.com)
c) you can back test your system on stocks of companies that
do not pay dividends or the dividends are small.
One general note: I think that for the purpose of back testing your
system it is not THAT important. Of course you will get different results
but I am sure that this difference will not change great system into
bad one and vice versa.
Hope it helps.
Best regards,
Tomasz Janeczko
===============
AmiBroker - the comprehensive share manager.
http://www.amibroker.com
----- Original Message -----
From: <tpresley@xxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Tuesday, February 27, 2001 4:55 PM
Subject: [amibroker] Yahoo Historical Data
> Has anyone noticed how yahoo historical data is adjusted to account
> for dividends? For example look at the data for WFC (Wells Fargo)
> here:
>
> http://chart.yahoo.com/t?
> a=11&b=24&c=85&d=02&e=30&f=01&g=d&s=wfc&y=0&z=wfc
>
> On the web page it shows the correct data and adds a final column
> adjusted for the dividend. *However* if you download the data using
> the link at the bottom of the page, all of the data is then modified.
> All the prices (high/low/open/close) are reduced by the dividend
> amount. It gets worse as the dividends are added up and subtracted
> from the stock price.
>
> This is bad for me as I want to use the history to test my trading
> system, but the data is not correct.
>
> Amiquote and any program that downloads data from yahoo suffers this
> problem.
>
> Questions:
>
> 1) Does anyone understand *why* this happens
>
> 2) More important, is there any way to fix this?
>
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
|