https://ifpri.r-universe.dev/EFFORThttps://ifpri.r-universe.dev/api/packages/EFFORThttps://ifpri.r-universe.dev/EFFORT/EFFORT.pdfhttps://ifpri.r-universe.dev/EFFORT/doc/manual.htmlhttps://ifpri.r-universe.dev/EFFORT/citationhttps://ifpri.r-universe.dev/EFFORT/citation.txthttps://ifpri.r-universe.dev/EFFORT/citation.cff