The NFCI is a weighted average of 105 indicators of risk, credit, and leverage in the financial system — each expressed relative to its sample average and scaled by its sample standard deviation. As such, a zero value for the NFCI can be thought of as the U.S. financial system operating at historical average levels of risk, credit, and leverage.
Positive values of the NFCI indicate financial conditions that are tighter than on average, while negative values indicate financial conditions that are looser than on average.