This is a research work I did recently and after trying very shortly to publish it in academic papers, I stopped trying. Maybe it is not good enough. Maybe the research world and I do not fit! It is the result of two series of research I have done for years, one about Stanford-related spin-offs and another about equity in start-ups.
I encourage you to read it if the field is of interest for you or just have a look at the tables below which I extracted from this 5-page short document.