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Missing data can always be detected using something like this:
valuewhen(datenum()==yymmdd,C);
or
valuewhen(cross(datenum(),yymmdd),C);
Even in AB's poor cousin, missing data can always be detected:
http://www.metastocktools.com/MetaStock/Missing.txt
To illustrate why padded data is not useful, take a look at simple
EMA/price crossover signals. You'll find that sometimes the signals
will appear when the instrument is not trading.
Another reason for avoiding padded data, is that smoothing-type
indicator values are skewed by data that does not exist in reality.
jose '-)
http://www.metastocktools.com
--- In amibroker@xxxxxxxxxxxxxxx, "wizard_inetsys" <wizard@xxxx>
wrote:
>
> Hi Jose,
>
> So padded data is no good then? But doesn't the fact that you have
> missing days with unpadded data affect you system also? For example,
> if you want your system to alert you when a stock hasn't been traded
> for a couple of days so you can get out, you couldn't do that with
> unpadded data as easily. Or am I thinking about this all wrong?
>
> So, does Amibroker have a problem using one or the other? And, what
> is recommeded - padded or unpadded?
>
> Thanks,
> Andrew.
>
> -- In amibroker@xxxxxxxxxxxxxxx, "Jose" <josesilva22@xxxx> wrote:
>
> ... and that is a good thing. Padded data destroys the integrity
> of T/A and system testing.
>
> jose '-)
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