https://cran.r-universe.dev/swcEconhttps://cran.r-universe.dev/api/packages/swcEconhttps://cran.r-universe.dev/swcEcon/swcEcon.pdfhttps://cran.r-universe.dev/swcEcon/doc/manual.htmlhttps://cran.r-universe.dev/swcEcon/NEWShttps://cran.r-universe.dev/swcEcon/NEWS.txthttps://cran.r-universe.dev/swcEcon/citationhttps://cran.r-universe.dev/swcEcon/citation.txthttps://cran.r-universe.dev/swcEcon/citation.cffhttps://cran.r-universe.dev/swcEcon/doc/swcEcon-intro.Rmdhttps://cran.r-universe.dev/articles/swcEcon/swcEcon-intro.html