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#gennic
10-05-2015,
Hey all,

Does anyone know where I can get historical data to backtest my EA. Cause I've read on forums that the MetaQuote downloadable datasets are inaccurate. I've also tried downloading the Alpari set, but the link doesn't seem to work.

Thanks.

SP

abjnqcfnj
10-05-2015,
Alpari no longer offer Historical data and alternative data sources don't reflect the flattening algorithims used by brokers and can give false signals with sensitive EAs.

Does anyone have Alpari historical data that they would share for EURUSD and GBPUSD pairs ?

afuhcbbffe
10-06-2015,
This is new to me, Gentlemen.

What is so good about the Alpari data, i.e. how much / how many years data is there? It's tick data, I guess?

What are the inaccuracies in this MetaQuote data?

And lastly, what are these flattening algorithms used by brokers (& which brokers)?

Adelinahich
10-06-2015,
Hi Adamus
as I understand it brokers can apply "flattening" or averaging algorithms the idea being that they don't send out massive amounts of tick data and they needn't process huge volumes of raw data - trillions of dollars of trading around the world creates an aweful lot of data for a broker to forward to my little flash browser!
Also different brokers get data from different sources which themselves can average data and often have diff rules as to what constitutes legit data in the first place eg false tick recognition algorithms and the such blah blah.

These diffs are seen when comparing data sources, eg eSignal hist to MT history data to Ninja hist to many of the "free" sources, some spike where others do not at all for eg. I don't know if Alpari data is necessarily better than anyone else, just that as it is my broker and my EA is price sensitive it is sensible that I use thier data to test with to get as close to real as possible.

If you have that data or know someone who has it I would be interested.

Afhawln
10-07-2015,
Thanks for the info. Makes total sense. I did know they did that, I just hadn't a clue what they called it.

So it implies you are only going to get all the ticks if you got straight to the source - e.g. Globex. I guess some of the quote vendors supply everything.

Sorry but I don't know anyone who's got Alpari data.
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