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Global investor,
Thank you very much for your kind and informative reply.
ggoom
--- In amibroker@xxxxxxxxxxxxxxx, "global_investor"
<independent_opinion@xxx> wrote:
>
> ggoom,
>
> I don't know if you have followed earlier discussions about IQFeed.
> It is wellknown that IQFeed is (still) an unfiltered feed. Historical
> intraday time series, stored on the IQFeed servers, are calculated by
> tick data aggregation. Since the tick data is unfiltered, which
> means that it can include bad ticks, this results in historical
> minute data time series which can have a lot of erroneous bars, also
> referred to by many users as "spikes". In particular, IQFeed's
> historical minute data for very actively traded stocks often includes
> these "spikes".
>
> As for historical time series with timeframe daily, they are not
> calculated by unfiltered tick data aggregation, therefore the data is
> much cleaner. Only the last (= rightmost) bar displayed in the
> Amibroker chart is calculated by aggregating all streaming quotes
> received during the trading session, which means that it can be wrong
> if Amibroker received some bad ticks.
>
> DTN's Jay Froscheiser has repeatedly promised improvements to IQFeed's
> historical server architecture for (more than) 2 years already. But
> nothing has happened so far if I'm not mistaken. I suppose that, as
> far as the API is concerned, things move only slowly too.
>
> Nevertheless, IQFeed is not totally bad, and it holds good promise if
> certain improvements are eventually implemented. Personally, I'd of
> course love to get much cleaner data, but at present I stick with
> IQFeed simply for the fact that I can watch the movements of a large
> number of stocks in realtime (using timeframe "daily", not intraday
> bars), for a much lower monthly price than a comparable Esignal
> subscription would cost.
>
> I do not do much minute data charting, given that I don't have the
> time for daytrading anyway. So whether IQFeed could be a feed for
> you, it depends on your exact requirements and trading habits.
>
> If clean data is important to you, for charting or to run trading
> systems, and if you don't need a high symbol limit, my recommendation
> would therefore be NOT to chose IQFeed right now and stay with Esignal
> for the time being.
>
>
> Hope it helps.
>
>
> -- In amibroker@xxxxxxxxxxxxxxx, "ggoom" <ggoom@> wrote:
> >
> > Global investor,
> >
> > Do you mean IQfeed is fine for intraday data usage?
> > I was considering moving to IQfeed (but stopped because of these
> > issues discussed here) and I only use minute bars in my chart and AA.
> > So I wonder whether you have some on-hand knowledge about it?
> > Thanks.
> >
> > ggoom
> >
>
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