I am wondering about the huge differences of the data provider google finance and yahoo finance. I am interested in the monthly data from adidas listed on xetra. In google: ETR:ADS and in yahoo finance: ADS.DE - Xetra.
There is a huge difference in the data, e.g. consider the 02.06.2008:
Date Open High Low Close Volume Jun 2, 2008 45.49 45.60 44.93 45.05 1,037,644
yahoo finance (german):
Datum Eröffnungskurs Max. Tief Schluss Ø Volumen Adj. Schluss* 2. Jun 2008 45,49 46,48 39,39 40,11 1.603.100 38,34
As you can see the open ("Eröffnungskurs") is the same. But all other values are different. So currency seems not to be the problem. But why are these values so different?
Also, why is there a yahoo finance gap in August 2008? I don't get the value of the 01.08.2008 but the 18. Aug 2008 instead? Since I am using the yahoo finance data I have to fill in this gap, what value / what method would be appropriate?