Surface waves can be used to estimate near-surface shear wave velocity (VS) models due to their dispersive nature: local dispersion curves (DCs) are subjected to a significant dependency to time-average velocity (Vsz) and the relationship between the wavelength of surface waves and the investigation depth is used to directly transform DCs into Vsz, avoiding the inversion procedure. Such a technique, known as W/D method, has been recently introduced but the estimation of the interval VS from noisy Vsz using a DIX type equation requires regularization of the data. A synthetic dataset of 1D VS models has been generated with a stochastic approach based on a Monte Carlo procedure.