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annotate scripts/statistics/models/private/logistic_regression_likelihood.m @ 17184:abf384f5d243

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maint: Remove unneeded input validation from internal fcns in private/ directories. * scripts/general/private/__isequal__.m, scripts/general/private/__splinen__.m, scripts/image/private/__imwrite__.m, scripts/image/private/ind2x.m, scripts/miscellaneous/private/__xzip__.m, scripts/miscellaneous/private/display_info_file.m, scripts/pkg/private/describe.m, scripts/pkg/private/get_forge_pkg.m, scripts/pkg/private/unload_packages.m, scripts/plot/private/__actual_axis_position__.m, scripts/plot/private/__add_datasource__.m, scripts/plot/private/__clabel__.m, scripts/plot/private/__errcomm__.m, scripts/plot/private/__errplot__.m, scripts/plot/private/__fltk_print__.m, scripts/plot/private/__gnuplot_get_var__.m, scripts/plot/private/__go_draw_axes__.m, scripts/plot/private/__go_draw_figure__.m, scripts/plot/private/__interp_cube__.m, scripts/plot/private/__line__.m, scripts/plot/private/__next_line_color__.m, scripts/plot/private/__next_line_style__.m, scripts/plot/private/__plt__.m, scripts/plot/private/__pltopt__.m, scripts/signal/private/rectangle_lw.m, scripts/signal/private/rectangle_sw.m, scripts/signal/private/triangle_lw.m, scripts/signal/private/triangle_sw.m, scripts/sparse/private/__sprand_impl__.m, scripts/statistics/models/private/logistic_regression_derivatives.m, scripts/statistics/models/private/logistic_regression_likelihood.m: Remove unneeded input validation from internal fcns in private/ directories.
author Rik <rik@octave.org>
date Sun, 04 Aug 2013 18:13:08 -0700
parents 5d3a684236b0
children 1c89599167a6
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72c96de7a403 maint: update copyright notices for 2012
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1 ## Copyright (C) 1995-2012 Kurt Hornik
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {[@var{g}, @var{g1}, @var{p}, @var{dev}] =} logistic_regression_likelihood (@var{y}, @var{x}, @var{beta}, @var{z}, @var{z1})
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21 ## Calculate the likelihood for the ordinal logistic regression model.
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22 ## Private function called by @code{logistic_regression}.
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23 ## @seealso{logistic_regression}
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24 ## @end deftypefn
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25
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26 ## Author: Gordon K. Smyth <gks@maths.uq.oz.au>
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27 ## Adapted-By: KH <Kurt.Hornik@wu-wien.ac.at>
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28 ## Description: Likelihood in logistic regression
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29
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30 function [g, g1, p, dev] = logistic_regression_likelihood (y, x, beta, z, z1)
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32 e = exp ([z, x] * beta); e1 = exp ([z1, x] * beta);
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33 g = e ./ (1 + e); g1 = e1 ./ (1 + e1);
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34 g = max (y == max (y), g); g1 = min (y > min (y), g1);
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35
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36 p = g - g1;
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37 dev = -2 * sum (log (p));
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38
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39 endfunction