function [y] = morretal06(xx, k1) %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % MORRIS ET AL. (2006) FUNCTION % % Authors: Sonja Surjanovic, Simon Fraser University % Derek Bingham, Simon Fraser University % Questions/Comments: Please email Derek Bingham at dbingham@stat.sfu.ca. % % Copyright 2013. Derek Bingham, Simon Fraser University. % % THERE IS NO WARRANTY, EXPRESS OR IMPLIED. WE DO NOT ASSUME ANY LIABILITY % FOR THE USE OF THIS SOFTWARE. If software is modified to produce % derivative works, such modified software should be clearly marked. % Additionally, this program 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; version 2.0 of the License. % Accordingly, 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. % % For function details and reference information, see: % http://www.sfu.ca/~ssurjano/ % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % INPUTS: % % xx = [x1, x2, ..., x30] % k1 = number of arguments with an effect (optional), with default value % 2 % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% if (nargin == 1) k1 = 2; end alpha = sqrt(12) - 6*sqrt(0.1)*sqrt(k1-1); beta = 12 * sqrt(0.1) / sqrt(k1-1); sum1 = 0; for ii = 1:k1 xi = xx(ii); sum1 = sum1 + xi; end term1 = alpha * sum1; sum2 = 0; for ii = 1:(k1-1) xi = xx(ii); for jj = (ii+1):k1 xj = xx(jj); sum2 = sum2 + xi*xj; end end term2 = beta * sum2; y = term1 + term2;