“…With this method "first order" uncertainties are computed using the derivatives of the function F that associates the output parameters to the input parameters. The hierarchization of the inputs of the function F according to their influence on the outputs of F is provided by the Singular Value Decomposition (SVD) of the Jacobian matrix F (x) [21,6,7,1]; see also [35] for the history of the SVD and [16] for a detailed description. It is interesting to note that the SVD, the main tool for the deterministic approach described here, is also commonly used in statistical data analysis, see [8,9,25,36].…”