/usr/lib/R/site-library/quantreg/demo/ is in r-cran-quantreg 5.21-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/R/site-library/quantreg/demo/Frank.R
/usr/lib/R/site-library/quantreg/demo/KMvCRQ.R
/usr/lib/R/site-library/quantreg/demo/Mammals.R
/usr/lib/R/site-library/quantreg/demo/Mel.R
/usr/lib/R/site-library/quantreg/demo/RB-r.R
/usr/lib/R/site-library/quantreg/demo/arqss.R
/usr/lib/R/site-library/quantreg/demo/cobar.R
/usr/lib/R/site-library/quantreg/demo/combos.R
/usr/lib/R/site-library/quantreg/demo/cpoint.R
/usr/lib/R/site-library/quantreg/demo/crquis.R
/usr/lib/R/site-library/quantreg/demo/engel1.R
/usr/lib/R/site-library/quantreg/demo/engel2.R
/usr/lib/R/site-library/quantreg/demo/hinged.R
/usr/lib/R/site-library/quantreg/demo/predemo.R
/usr/lib/R/site-library/quantreg/demo/rqsslasso.R