The link says
"Almost half of [American] iPhone 5C owners switched from competitor brands, particularly Samsung and LG,"
How does that prove that "Half of Apple's iPhone 5c sales are to Android switchers"
I read it as suggesting that the half in question already owned phones that were not iPhones but that they could have been a mixture of Symbian, WM, WP, Android, etc.
Accordingly doesn't it follows that the remaining 50% were a combination of existing...