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> I've downloaded from Yahoo the 20-years Nasdaq shares in order to
> backtest in Amibroker, but I have now a big doubt.
>
> Are the tickers I have downloaded, ALL the tickers of the 20 years??
>
No.
The Nasdaq has been subject to high turnover.
> because I think that if sometimes some tickers fall from Nasdaq, and
> other ones go into Nasdaq, the historic backtest using the nasdaq
> tickers of today, is not realistic..
>
> Or not?
No, it is not realistic (especially with the Nasdaq).
Survivor bias is not that simple - it works both ways - successful
stocks disapear due to acquistions etc.
Is there any way to have the real Nasdaq100, with inputs and
> outputs??
Yes.
There is a list of partial resources, for managing delisted stocks,
at the UKB - please search there for "delisted".
You will also find some past discussion in this forum under "survivor
bias" or delisted - I also found some good discussion at the Elite
Traders forum using the same search.
http://www.amibroker.org/userkb/
Lookunder DatabaseManagement >> DatabaseManagementResources >>
Tracking Stock Changes
brian_z
--- In amibroker@xxxxxxxxxxxxxxx, "gonzagags" <gonzagags@xxx> wrote:
>
> Hello
> I've downloaded from Yahoo the 20-years Nasdaq shares in order to
> backtest in Amibroker, but I have now a big doubt.
>
> Are the tickers I have downloaded, ALL the tickers of the 20 years??
>
> because I think that if sometimes some tickers fall from Nasdaq, and
> other ones go into Nasdaq, the historic backtest using the nasdaq
> tickers of today, is not realistic..
>
> Or not? Is there any way to have the real Nasdaq100, with inputs and
> outputs??
>
> Thanks very much..
>
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