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Z8 and Yahoo data provider #459985
06/13/16 11:09
06/13/16 11:09
Joined: Sep 2013
Posts: 64
Spain
yosoytrader Offline OP
Junior Member
yosoytrader  Offline OP
Junior Member

Joined: Sep 2013
Posts: 64
Spain
Hi guys,

I've just noticed that there's a new Z8 system, which uses daily data.
It looks like it's using the Yahoo data,,,,well, I don't know what type of calculations Z8 performs on the data, but BEWARE, Yahoo data is NOT suitable for trading, as it's NOT dividend or split adjusted !!!!!! SO YOU'LL FIND PLENTY OF GAPS!!!


Happy trading laugh
Re: Z8 and Yahoo data provider [Re: yosoytrader] #459986
06/13/16 11:10
06/13/16 11:10
Joined: Jul 2000
Posts: 27,986
Frankfurt
jcl Offline

Chief Engineer
jcl  Offline

Chief Engineer

Joined: Jul 2000
Posts: 27,986
Frankfurt
Sure it is dividend and split adjusted.

Re: Z8 and Yahoo data provider [Re: jcl] #459988
06/13/16 11:14
06/13/16 11:14
Joined: Sep 2013
Posts: 64
Spain
yosoytrader Offline OP
Junior Member
yosoytrader  Offline OP
Junior Member

Joined: Sep 2013
Posts: 64
Spain
Hi jcl, maybe you're using a different Yahoo api than me, in that case it's ok, but guys, be sure to check if it is adjusted across all markets that you'll use

Cheers

Re: Z8 and Yahoo data provider [Re: yosoytrader] #460116
06/16/16 17:11
06/16/16 17:11
Joined: Feb 2015
Posts: 652
Milano, Italy
M
MatPed Offline
User
MatPed  Offline
User
M

Joined: Feb 2015
Posts: 652
Milano, Italy
Hi, I found issue in YAHOO data too.
Selecting my own portfolio for the markowitz optimization I received this portfolio re-balancing suggestion

Test: mpMVO portfolio 2011..2016
X57E.MI: 2 Contracts at 234$
X710.MI: 17 Contracts at 256$
X105.MI: 28 Contracts at 278$
X15E.MI: 4 Contracts at 337$
CSBGE0.MI: 66 Contracts at 156$

while the first 4 ETF prices are corrects the price of CSBGE0.MI is wrong as you can see from the pic. I do not understand where the issue is and I can not estimate which is the impact on the system.

Ciao

Attached Files Immagine.png
Re: Z8 and Yahoo data provider [Re: MatPed] #460117
06/16/16 17:55
06/16/16 17:55
Joined: Jul 2000
Posts: 27,986
Frankfurt
jcl Offline

Chief Engineer
jcl  Offline

Chief Engineer

Joined: Jul 2000
Posts: 27,986
Frankfurt
Programmer's first rule: If you don't understand a result, check your typing. wink

Re: Z8 and Yahoo data provider [Re: jcl] #460138
06/17/16 09:24
06/17/16 09:24
Joined: Feb 2015
Posts: 652
Milano, Italy
M
MatPed Offline
User
MatPed  Offline
User
M

Joined: Feb 2015
Posts: 652
Milano, Italy
Shame on me! I had checked several time, but...


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