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function [SAmeas, OutMatrix] = Morris_Measure_Groups(NumFact, Sample, Output, p, Group)
% [SAmeas, OutMatrix] = Morris_Measure_Groups(NumFact, Sample, Output, p, Group)
%
% Given the Morris sample matrix, the output values and the group matrix compute the Morris measures
% -------------------------------------------------------------------------
% INPUTS
% -------------------------------------------------------------------------
% Group [NumFactor, NumGroups] := Matrix describing the groups.
% Each column represents one group.
% The element of each column are zero if the factor is not in the
% group. Otherwise it is 1.
%
% Sample := Matrix of the Morris sampled trajectories
%
% Output := Matrix of the output(s) values in correspondence of each point
% of each trajectory
%
% k = Number of factors
% -------------------------------------------------------------------------
% OUTPUTS
% OutMatrix (NumFactor*NumOutputs, 3)= [Mu*, Mu, StDev]
% for each output it gives the three measures of each factor
% -------------------------------------------------------------------------
%
% Written by Jessica Cariboni and Francesca Campolongo
% Joint Research Centre, The European Commission,
%
% Copyright (C) 2005 European Commission
% Copyright (C) 2012-2017 Dynare Team
%
% This file is part of Dynare.
%
% Dynare is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% Dynare 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.
%
% You should have received a copy of the GNU General Public License
% along with Dynare. If not, see <http://www.gnu.org/licenses/>.
if nargin==0
skipline()
disp('[SAmeas, OutMatrix] = Morris_Measure_Groups(NumFact, Sample, Output, p, Group);')
return
end
OutMatrix=[];
if nargin < 5, Group=[]; end
NumGroups = size(Group,2);
if nargin < 4 | isempty(p)
p = 4;
end
Delt = p/(2*p-2);
if NumGroups ~ 0
sizea = NumGroups; % Number of groups
GroupMat=Group;
GroupMat = GroupMat';
else
sizea = NumFact;
end
r=size(Sample,1)/(sizea+1); % Number of trajectories
% For Each Output
for k=1:size(Output,2)
OutValues=Output(:,k);
% For each r trajectory
for i=1:r
% For each step j in the trajectory
% Read the orientation matrix fact for the r-th sampling
% Read the corresponding output values
Single_Sample = Sample(i+(i-1)*sizea:i+(i-1)*sizea+sizea,:);
Single_OutValues = OutValues(i+(i-1)*sizea:i+(i-1)*sizea+sizea,:);
A = (Single_Sample(2:sizea+1,:)-Single_Sample(1:sizea,:))';
Delta = A(find(A));
% For each point of the fixed trajectory compute the values of the Morris function. The function
% is partitioned in four parts, from order zero to order 4th.
for j=1:sizea % For each point in the trajectory i.e for each factor
% matrix of factor which changes
if NumGroups ~ 0
AuxFind (:,1) = A(:,j);
% AuxFind(find(A(:,j)),1)=1;
% Pippo = sum((Group - repmat(AuxFind,1,NumGroups)),1);
% Change_factor(j,i) = find(Pippo==0);
Change_factor = find(abs(AuxFind)>1e-010);
% If we deal with groups we can only estimate the new mu*
% measure since factors in the same groups can move in
% opposite direction and the definition of the standard
% Morris mu cannopt be applied.
% In the new version the elementary effect is defined with
% the absolute value.
%SAmeas(find(GroupMat(Change_factor(j,i),:)),i) = abs((Single_OutValues(j) - Single_OutValues(j+1) )/Delt); %(2/3));
SAmeas(i,Change_factor') = abs((Single_OutValues(j) - Single_OutValues(j+1) )/Delt);
else
Change_factor(j,i) = find(Single_Sample(j+1,:)-Single_Sample(j,:));
% If no groups --> we compute both the original and
% modified measure
if Delta(j) > 0 %=> +Delta
SAmeas(Change_factor(j,i),i) = (Single_OutValues(j+1) - Single_OutValues(j) )/Delt; %(2/3);
else %=> -Delta
SAmeas(Change_factor(j,i),i) = (Single_OutValues(j) - Single_OutValues(j+1) )/Delt; %(2/3);
end
end
end %for j=1:sizea
end %for i=1:r
if NumGroups ~ 0
SAmeas = SAmeas';
end
% Compute Mu AbsMu and StDev
if any(any(isnan(SAmeas)))
for j=1:NumFact
SAm = SAmeas(j,:);
SAm = SAm(find(~isnan(SAm)));
rr=length(SAm);
AbsMu(j,1) = sum(abs(SAm),2)/rr;
if NumGroups == 0
Mu(j,1) = sum(SAm,2)/rr;
StDev(j,1) = sum((SAm - repmat(Mu(j),1,rr)).^2/(rr*(rr-1)),2).^0.5;
end
end
else
AbsMu = sum(abs(SAmeas),2)/r;
if NumGroups == 0
Mu = sum(SAmeas,2)/r;
StDev = sum((SAmeas - repmat(Mu,1,r)).^2/(r*(r-1)),2).^0.5;
end
end
% Define the output Matrix - if we have groups we cannot define the old
% measure mu, only mu* makes sense
if NumGroups > 0
OutMatrix = [OutMatrix; AbsMu];
else
OutMatrix = [OutMatrix; AbsMu, Mu, StDev];
end
end % For Each Output
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