I've been using Telechart data for some time now, and I've been looking at migrating to using Yahoo data in it's place (I'd also consider other data providers).
When I've run very simple backtests on my Telechart and Yahoo data, I get vastly, vastly different results. Now I would expect some of that due to the fact that Telechart data, as I understand it, is not split adjusted when it comes through the API, as opposed to Yahoo data, which I believe is. But the stocks I trade - mainly ETFs - don't split that often. So I'm just curious if anyone else has experienced the same issues. Any thoughts appreciated.
