Mercurial > hg > octave-nkf
annotate scripts/statistics/tests/chisquare_test_independence.m @ 17338:1c89599167a6
maint: End m-files with 1 blank line.
Simplifies automated grammarchecking script.
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scripts/ui/private/message_dialog.m: End m-files with 1 blank line.
| author | Rik <rik@octave.org> |
|---|---|
| date | Wed, 28 Aug 2013 08:33:02 -0700 |
| parents | 5d3a684236b0 |
| children | d63878346099 |
| rev | line source |
|---|---|
|
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1 ## Copyright (C) 1995-2012 Kurt Hornik |
| 3426 | 2 ## |
| 3922 | 3 ## This file is part of Octave. |
| 4 ## | |
| 5 ## Octave is free software; you can redistribute it and/or modify it | |
| 6 ## under the terms of the GNU General Public License as published by | |
| 7016 | 7 ## the Free Software Foundation; either version 3 of the License, or (at |
| 8 ## your option) any later version. | |
| 3426 | 9 ## |
| 3922 | 10 ## Octave is distributed in the hope that it will be useful, but |
| 3200 | 11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 3426 | 13 ## General Public License for more details. |
| 14 ## | |
| 3200 | 15 ## You should have received a copy of the GNU General Public License |
| 7016 | 16 ## along with Octave; see the file COPYING. If not, see |
| 17 ## <http://www.gnu.org/licenses/>. | |
| 3200 | 18 |
| 3454 | 19 ## -*- texinfo -*- |
| 20 ## @deftypefn {Function File} {[@var{pval}, @var{chisq}, @var{df}] =} chisquare_test_independence (@var{x}) | |
| 7001 | 21 ## Perform a chi-square test for independence based on the contingency |
| 3454 | 22 ## table @var{x}. Under the null hypothesis of independence, |
| 23 ## @var{chisq} approximately has a chi-square distribution with | |
| 24 ## @var{df} degrees of freedom. | |
| 3200 | 25 ## |
| 3454 | 26 ## The p-value (1 minus the CDF of this distribution at chisq) of the |
| 27 ## test is returned in @var{pval}. | |
| 3200 | 28 ## |
| 29 ## If no output argument is given, the p-value is displayed. | |
| 3454 | 30 ## @end deftypefn |
| 3200 | 31 |
| 5428 | 32 ## Author: KH <Kurt.Hornik@wu-wien.ac.at> |
| 3456 | 33 ## Description: Chi-square test for independence |
| 3200 | 34 |
|
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35 function [pval, chisq, df] = chisquare_test_independence (x) |
| 3200 | 36 |
| 37 if (nargin != 1) | |
| 6046 | 38 print_usage (); |
| 3200 | 39 endif |
| 3426 | 40 |
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41 [r, s] = size (x); |
| 3238 | 42 df = (r - 1) * (s - 1); |
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43 n = sum (sum (x)); |
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44 y = sum (x')' * sum (x) / n; |
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45 x = (x - y) .^2 ./ y; |
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46 chisq = sum (sum (x)); |
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47 pval = 1 - chi2cdf (chisq, df); |
| 3426 | 48 |
| 3200 | 49 if (nargout == 0) |
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50 printf (" pval: %g\n", pval); |
| 3200 | 51 endif |
| 52 | |
| 7001 | 53 endfunction |
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54 |