Functions for kernel smoothing for Wand & Jones (1995)
c(person("Matt", "Wand", role = "aut", email =
        "Matt.Wand@uts.edu.au"), person("Brian", "Ripley", role =
        c("trl", "cre", "ctb"), email = "ripley@stats.ox.ac.uk",
        comment = "R port and updates"))
functions for kernel smoothing (and density estimation)
        corresponding to the book: Wand, M.P. and Jones, M.C. (1995)
        "Kernel Smoothing".
Matt Wand [aut], Brian Ripley [trl, cre, ctb] (R port and
        updates)