There are multiple definitions:

1. global function index(English)

   • ratio of stroke volume to the sum of mean ventricular cavity and myocardial volumes
   • EF, EDV, ESV, LVGFI, LVM, SV, MCF, rTOF
   • Cardiology, Ratio-based metric
   • https://doi.org…JAHA.120.016308
   • https://doi.org…cvm.2021.695883

2. goodness of fit index(English)

   • applied to hookah tobacco smoking cessation in Iranian rural adults
   • CFI, CVR, RMSEA, TTM, AGFI, CFA, DBI, EFA, NFI, NNFI, GFI, SEM, SRMR
   • Addiction and health, Model(ing), Statistics
   • https://doi.org…2/ahj.v10i2.563
   • https://doi.org…2889-017-4425-2
   • https://doi.org…877-021-02291-x