The article offsets the data by the year the incubator started. This is not relevant fort a start-up having to pick an incubator today. I think it would be more

The article offsets the data by the year the incubator started. This is not relevant fort a start-up having to pick an incubator today. I think it would be more interesting to see what percentage of current graduates raise series A. My guess is that this is highest for YC but still only one in five. Of course there are also cash flow businesses that don't need to raise but these are the exception rather than the rule. Disclosure: winter 2015 YC graduate and a big fan of YC