2008-09-03 18:05:35 +02:00
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function [marginal,oo_] = marginal_density(M_, options_, estim_params_, oo_)
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2008-01-17 15:53:48 +01:00
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% function marginal = marginal_density()
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% Computes the marginal density
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%
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% INPUTS
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2008-09-03 18:05:35 +02:00
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% options_ [structure]
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% estim_params_ [structure]
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% M_ [structure]
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% oo_ [structure]
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2008-01-17 15:53:48 +01:00
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%
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% OUTPUTS
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2008-09-03 18:05:35 +02:00
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% marginal: [double] marginal density (modified harmonic mean)
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% oo_ [structure]
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2008-01-17 15:53:48 +01:00
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%
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% SPECIAL REQUIREMENTS
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% none
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2011-02-10 15:54:23 +01:00
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% Copyright (C) 2005-2011 Dynare Team
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2008-08-01 14:40:33 +02:00
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%
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% This file is part of Dynare.
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%
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% Dynare is free software: you can redistribute it and/or modify
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% it under the terms of the GNU General Public License as published by
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% the Free Software Foundation, either version 3 of the License, or
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% (at your option) any later version.
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%
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% Dynare is distributed in the hope that it will be useful,
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% but WITHOUT ANY WARRANTY; without even the implied warranty of
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% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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% GNU General Public License for more details.
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%
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% You should have received a copy of the GNU General Public License
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% along with Dynare. If not, see <http://www.gnu.org/licenses/>.
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2008-01-17 15:53:48 +01:00
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2005-02-18 20:54:39 +01:00
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2005-09-10 12:04:22 +02:00
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npar = estim_params_.np+estim_params_.nvn+estim_params_.ncx+estim_params_.ncn+estim_params_.nvx;
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nblck = options_.mh_nblck;
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2005-02-18 20:54:39 +01:00
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2011-12-15 11:56:23 +01:00
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MhDirectoryName = CheckPath('metropolis',M_.dname);
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2008-06-24 20:20:48 +02:00
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load([ MhDirectoryName '/' M_.fname '_mh_history.mat'])
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2005-02-18 20:54:39 +01:00
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2005-09-10 12:04:22 +02:00
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FirstMhFile = record.KeepedDraws.FirstMhFile;
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FirstLine = record.KeepedDraws.FirstLine; ifil = FirstLine;
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TotalNumberOfMhFiles = sum(record.MhDraws(:,2));
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TotalNumberOfMhDraws = sum(record.MhDraws(:,1));
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MAX_nruns = ceil(options_.MaxNumberOfBytes/(npar+2)/8);
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2005-10-01 21:07:57 +02:00
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TODROP = floor(options_.mh_drop*TotalNumberOfMhDraws);
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2005-02-18 20:54:39 +01:00
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2008-09-18 18:28:57 +02:00
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fprintf('MH: I''m computing the posterior mean and covariance... ');
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[posterior_mean,posterior_covariance,posterior_mode,posterior_kernel_at_the_mode] = compute_mh_covariance_matrix();
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2005-02-18 20:54:39 +01:00
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2008-09-18 18:28:57 +02:00
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MU = transpose(posterior_mean);
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SIGMA = posterior_covariance;
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lpost_mode = posterior_kernel_at_the_mode;
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xparam1 = posterior_mean;
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2006-09-13 14:39:23 +02:00
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hh = inv(SIGMA);
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2005-09-10 12:04:22 +02:00
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fprintf(' Done!\n');
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2008-09-18 18:28:57 +02:00
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2006-09-13 14:39:23 +02:00
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%% save the posterior mean and the inverse of the covariance matrix
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%% (usefull if the user wants to perform some computations using
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%% the posterior mean instead of the posterior mode ==> ).
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2008-06-24 20:20:48 +02:00
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save([M_.fname '_mean.mat'],'xparam1','hh','SIGMA');
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2013-07-10 17:12:34 +02:00
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skipline()
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2013-06-13 14:24:17 +02:00
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disp('MH: I''m computing the posterior log marginal density (modified harmonic mean)... ');
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2005-09-10 12:04:22 +02:00
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detSIGMA = det(SIGMA);
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invSIGMA = inv(SIGMA);
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marginal = zeros(9,2);
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linee = 0;
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check_coverage = 1;
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increase = 1;
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while check_coverage
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2009-12-16 18:17:34 +01:00
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for p = 0.1:0.1:0.9;
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critval = chi2inv(p,npar);
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ifil = FirstLine;
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tmp = 0;
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for n = FirstMhFile:TotalNumberOfMhFiles
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for b=1:nblck
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load([ MhDirectoryName '/' M_.fname '_mh' int2str(n) '_blck' int2str(b) '.mat'],'x2','logpo2');
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EndOfFile = size(x2,1);
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for i = ifil:EndOfFile
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deviation = (x2(i,:)-MU)*invSIGMA*(x2(i,:)-MU)';
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if deviation <= critval
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lftheta = -log(p)-(npar*log(2*pi)+log(detSIGMA)+deviation)/2;
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tmp = tmp + exp(lftheta - logpo2(i) + lpost_mode);
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end
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end
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end
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ifil = 1;
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end
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linee = linee + 1;
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warning_old_state = warning;
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warning off;
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marginal(linee,:) = [p, lpost_mode-log(tmp/((TotalNumberOfMhDraws-TODROP)*nblck))];
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warning(warning_old_state);
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2005-09-10 12:04:22 +02:00
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end
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2011-02-10 15:54:23 +01:00
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if abs((marginal(9,2)-marginal(1,2))/marginal(9,2)) > 0.01 || isinf(marginal(1,2))
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2009-12-16 18:17:34 +01:00
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if increase == 1
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disp('MH: The support of the weighting density function is not large enough...')
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disp('MH: I increase the variance of this distribution.')
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increase = 1.2*increase;
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invSIGMA = inv(SIGMA*increase);
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detSIGMA = det(SIGMA*increase);
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linee = 0;
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else
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disp('MH: Let me try again.')
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increase = 1.2*increase;
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invSIGMA = inv(SIGMA*increase);
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detSIGMA = det(SIGMA*increase);
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linee = 0;
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if increase > 20
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check_coverage = 0;
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clear invSIGMA detSIGMA increase;
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disp('MH: There''s probably a problem with the modified harmonic mean estimator.')
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end
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end
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2005-09-10 12:04:22 +02:00
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else
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2009-12-16 18:17:34 +01:00
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check_coverage = 0;
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clear invSIGMA detSIGMA increase;
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disp('MH: Modified harmonic mean estimator, done!')
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end
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2005-09-10 12:04:22 +02:00
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end
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2005-02-18 20:54:39 +01:00
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2005-09-10 12:04:22 +02:00
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oo_.MarginalDensity.ModifiedHarmonicMean = mean(marginal(:,2));
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