Determining the biasing function from galaxy redshift surveys

We present a method for evaluating the biasing function of galaxies, delta (g)(delta), from a redshift survey from the cumulative distribution functions of galaxies and mass, C-g(delta (g)) and C(delta), respectively. Using a suite of N-body simulations of different cosmological models, we show how the nonlinear biasing function can be obtained with adequate accuracy directly from the observed counts in cells in redshift space under the assumption that C(delta) can be approximated by a cumulative log-normal distribution in 1+delta, Once applied to redshift surveys such as PSCz, 2dF, or SDSS the biasing function carl provide valuable constraints on galaxy formation and structure evolution.