https://michaeltopper1.r-universe.dev/panelsummaryhttps://michaeltopper1.r-universe.dev/api/packages/panelsummaryhttps://michaeltopper1.r-universe.dev/panelsummary/panelsummary.pdfhttps://michaeltopper1.r-universe.dev/panelsummary/doc/manual.htmlhttps://michaeltopper1.r-universe.dev/panelsummary/NEWShttps://michaeltopper1.r-universe.dev/panelsummary/NEWS.txthttps://michaeltopper1.r-universe.dev/panelsummary/citationhttps://michaeltopper1.r-universe.dev/panelsummary/citation.txthttps://michaeltopper1.r-universe.dev/panelsummary/citation.cffhttps://michaeltopper1.r-universe.dev/panelsummary/doc/adding_rows.Rmdhttps://michaeltopper1.r-universe.dev/articles/panelsummary/adding_rows.htmlhttps://michaeltopper1.r-universe.dev/panelsummary/doc/panelsummary.Rmdhttps://michaeltopper1.r-universe.dev/articles/panelsummary/panelsummary.htmlhttps://michaeltopper1.r-universe.dev/panelsummary/doc/with_fixest.Rmdhttps://michaeltopper1.r-universe.dev/articles/panelsummary/with_fixest.html