* The sign of correlation between vc funding and the presence of hubs is very sensitive to the measure of vc funding. It is positive for early investment and negative for later investments.
*The size and significance of the correlation is sensitive to number of deals vs the amount of funding. Results are more significant for number of deals compared to the results for value of the deals.
*Including SBIR data significantly reduces the number of groups in the panel and hence the sample size.