https://cran.r-universe.dev/DIDHADhttps://cran.r-universe.dev/api/packages/DIDHADhttps://cran.r-universe.dev/DIDHAD/DIDHAD.pdfhttps://cran.r-universe.dev/DIDHAD/doc/manual.htmlhttps://cran.r-universe.dev/DIDHAD/citationhttps://cran.r-universe.dev/DIDHAD/citation.txthttps://cran.r-universe.dev/DIDHAD/citation.cff