Not sure if anyone here knows about this but I was told that the data at Yahoo Finance for historical stock prices is not good to use because for some reason it is data on very thinly traded markets. They may have been referring in particular to prices for Japanese stocks like Sony or Nintendo and perhaps that could be because these are traded on the Tokyo Stock Market but the data on Yahoo Finance is for NYSE http://finance.yahoo.com/q?s=SNE
I can understand that but not for stocks like Coke or Ford. Does anyone know about this?
Also, if you know where I might get Sony prices for the Tokyo Stock Exchange or where I might go to look for it or a forum that might be helpful please let me know!