  An analysis of the data on forward $pp, \bar pp, \pi^{\pm}p$ and $K^{\pm}p$
scattering is performed making use of the single- and double-subtraction
integral and comparing with derivative dispersion relations for amplitudes.
Various pomeron and odderon models for the total cross sections are considered
and compared. The real part of the amplitude is calculated via dispersion
relations. It is shown that the integral dispersion relations lead to a better
description of the data for $\sqrt{s}>$5 GeV. Predictions of the considered
models for the TOTEM experiment at LHC energies are given
