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Yes, viewing holes in a chart's data is very useful to determine the
instrument's liquidity amongst other reasons.
In MetaStock, I plot a major index as a base security in a separate
window below the price chart, which forces the main price chart to
display the tell-tale holes of any missing data.
I'd imagine this can be done in AB as well, although I haven't tried
it.
jose '-)
--- In amibroker@xxxxxxxxxxxxxxx, Graham <kavemanperth@xxxx> wrote:
> I agree Jose
> The main problem for me is that unpadded makes it difficult to
> compare different stocks, even with the padding feature in AA.
> If the base ticker has a hole, then that day is ignored in the
> second ticker.
> Also I found that with eyeball charting having non traded days
> included is a help. My preference is for partial padding which only
> includes all days that the market is open.
> Indicators are next to useless with padded data.
>
>
> On Thu, 10 Feb 2005 05:25:35 -0000, Jose <josesilva22@xxxx> wrote:
>
>
> 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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