https://cran.wustl.edu/web/packages/npregfast/index.html
CRAN: Package npregfast
A method for obtaining nonparametric estimates of regression models with or without factor-by-curve interactions using local polynomial kernel smoothers or...
cranpackage
https://www.r-project.org/nosvn/R.check/r-devel-linux-x86_64-fedora-clang/npregfast-00check.html
Check results for 'npregfast'
check results