This contribution provides information about correlations among the neutron-proton (np) elastic scattering observables. The most basic prerequisite for this study is existence of models of the nucleon-nucleon (NN) force, for which a covariance matrix of potential parameters is available. Using the covariance matrices for the chiral SMS NN potential from the Bochum-Bonn group and the one for the OPE-Gaussian potential proposed by the Granada group, we performed a systematic analysis of the correlation coefficients between the differential cross section and the depolarization R, as well as between R and the polarization P.