What, if any, is the correlation between the skillset needed to be successful at a Ph.D. and start a successful company? Does a Ph.D. prepare you for founding a startup? Which skills are similar, which are not?

My initial hunch is that the self-motivation needed for a Ph.D. is also what startup founders need to succeed, and that launching a startup out of your Ph.D. is one of the better ways of getting a company off the ground.

To give some context, I'm a current Ph.D. admit, and I'm one of the lucky few that gets to choose between Stanford, Berkeley (my current school), CMU and UW. I'm focused on Graphics, but I'm confident that I'd like to be involved in startups after my Ph.D. So I'm trying to decide which of these schools to go to, and whether my intuition about Ph.Ds and Startups are shared by others.