Estimating the NIH efficient frontier

Background: The National Institutes of Health (NIH) is among the world’s largest investors in biomedical research, with a mandate to: ‘‘…lengthen life, and reduce the burdens of illness and disability.’ ’ Its funding decisions have been criticized as insufficiently focused on disease burden. We hypothesize that modern portfolio theory can create a closer link between basic research and outcome, and offer insight into basic-science related improvements in public health. We propose portfolio theory as a systematic framework for making biomedical funding allocation decisions–one that is directly tied to the risk/reward trade-off of burden-of-disease outcomes. Methods and Findings: Using data from 1965 to 2007, we provide estimates of the NIH ‘‘efficient frontier’’, the set of funding allocations across 7 groups of disease-oriented NIH institutes that yield the greatest expected return on investment for a given level of risk, where return on investment is measured by subsequent impact on U.S. years of life lost (YLL). The results suggest that NIH may be actively managing its research risk, given that the volatility of its current allocation is 17% less than that of an equal-allocation portfolio with similar expected returns. The estimated efficient frontier suggests that further improvements in expected return (89 % to 119 % vs. current) or reduction in risk (22 % to 35 % vs. current) are available holding risk or expected return, respectively, constant, and that 28 % to 89 % greater decrease in average years-of-life-lost per unit risk may be achievable. However, these results also reflect the imprecision of YLL as a measure of diseas