https://villegar.r-universe.dev/trainRhttps://villegar.r-universe.dev/api/packages/trainRhttps://villegar.r-universe.dev/trainR/trainR.pdfhttps://villegar.r-universe.dev/trainR/doc/manual.htmlhttps://villegar.r-universe.dev/trainR/NEWShttps://villegar.r-universe.dev/trainR/NEWS.txthttps://villegar.r-universe.dev/trainR/citationhttps://villegar.r-universe.dev/trainR/citation.txthttps://villegar.r-universe.dev/trainR/citation.cff