https://jonathanlees.r-universe.dev/PEIPhttps://jonathanlees.r-universe.dev/api/packages/PEIPhttps://jonathanlees.r-universe.dev/PEIP/PEIP.pdfhttps://jonathanlees.r-universe.dev/PEIP/doc/manual.htmlhttps://jonathanlees.r-universe.dev/PEIP/citationhttps://jonathanlees.r-universe.dev/PEIP/citation.txthttps://jonathanlees.r-universe.dev/PEIP/citation.cff