all the data on this is fuzzy, and may always be fuzzy. what type of startup it is is important, as well as the quality of the founders, none of which is easily quantifiable. I think the reality is that you make your own odds. a brilliant/determined/flexible founder can and will make something work.<p>I've always felt that what kills a startup are commitment/flexibility issues based on factors outside of the business itself - your spouse doesn't support you, you're only willing to live on peanuts for so long, children on the way, etc.<p>but I don't look at startup success as determined by Idea X, sink or swim. If you stay in the game long enough, and find a way to feed yourself in the meantime, you'll find a way.<p>also, as in life, you alone determine what is and isn't success. for many people, a lifestyle business that just allows you to work on your own terms (not too far past ramen profitability) is enough.