To calculate the Comparative Fit Index, subtract the ratio of model degrees of freedom (dfm) to baseline degrees of freedom (dfb) from the NFI. Then divide this result by 1 minus the same ratio (dfm/dfb).

**The Comparative Fit Index (CFI) is a statistical measure used in structural equation modeling to assess the fit of a proposed model compared to a baseline model.** It quantifies how well the proposed model fits the observed data relative to a more restricted baseline model.