nisp_sum — Returns the value of the Product function
y = nisp_sum ( x )
a 5-by-1 matrix of doubles
a np-by-2 matrix of doubles, where np is the number of experiments.
a np-by-1 matrix of doubles
This function returns the value of the Sum function.
This function is defined by
where X1, X2, X3, X4 are normal random variables with means mu1,mu2,mu3,mu4 and standard variations sigma1,sigma2,sigma3,sigma4.
"Sensitivity analysis in practice", Saltelli, Tarantolla, Compolongo, Ratto, Wiley, 2004
"An importance quantification technique in uncertainty analysis for computer models", Ishigami, Homma, 1990, Proceedings of the ISUMA'90. First international symposium on uncertainty modelling and Analysis, University of Maryland, USA, pp. 398-403.