  We present a theoretical formalism to predict the two-point clustering
statistics (the power spectrum and the two-point correlation function),
simultaneously taking account of the linear velocity distortion, the nonlinear
velocity distortion (finger-of-god), the cosmological redshift-space distortion
and the light-cone effect. To demonstrate the importance of these effects in
exploring the clustering of objects at high redshifts, we show several model
predictions for magnitude-limited surveys of galaxies and quasars. This
methodology provides a quantitative tool to confront theoretical models against
the upcoming precision data on clustering in the universe.
