NAME

       gbker - Produce kernel density estimation

SYNOPSIS

       gbker [options]

DESCRIPTION

       Compute  the  kernel  density  estimation  on  an equispaced grid. Data are read from standard input. The
       kernel bandwidth, if not provided with the option -H,  is  set  automatically  using  simple  heuristics.
       Normally  the  whole  support  is  displayed.  The  option  -w can be used to restrict the computation to
       specific range of values. The method used to compute the density is set by the option -M.  The boundaries
       of the grid are slightly different in the different cases.

OPTIONS

       -n     number of equispaced points/bins where the density is computed (default 64)

       -w     set the grid boundaries with min,max (default whole support)

       -H     set the kernel bandwidth

       -S     scale the automatic kernel bandwidth

       -K     choose the kernel to use  (default 0)

       0      Epanenchnikov

       1      Rectangular

       2      Gaussian

       3      Laplacian

       -M     choose the method for density computation (default 0)

       0      use FFT (# grid points rounded to nearest power of 2)

       1      use discrete convolution (compact kernels only; bins>2)

       2      explicit summation (boundaries excluded)

       -F     specify the input fields separators (default " \t")

EXAMPLES

       gbker -n 128 -K 2 < file
              use  a  Gaussian kernel to compute the density on 128 equispaced points with the FFT approach. All
              the data in 'file' are used, multiple columns are pooled.

       gbker -K 3 -M 2 < file
              use a Laplacian kernel to compute the density on 64 points.   The  method  used  is  the  explicit
              summation.

AUTHOR

       Written by Giulio Bottazzi

REPORTING BUGS

       Report bugs to <gbutils@googlegroups.com>

       Package home page <http://cafim.sssup.it/~giulio/software/gbutils/index.html>

COPYRIGHT

       Copyright  ©  2001-2018  Giulio  Bottazzi  This  program is free software; you can redistribute it and/or
       modify it under the terms of the GNU General Public License (version 2) as published by the Free Software
       Foundation;

       This  program  is  distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
       the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General  Public
       License for more details.