On the determination of large scale motion in the Universe

We consider the effect of a nonisotropic selection function on the estimated values of the large scale velocities of the galaxy distribution. We show that the direction of the velocity is correlated with the dipole anisotropy, and it is also effected by quadrupole and higher terms. These anisotropies seem to be unavoidable and their effect should be included when comparing the results of experiments to theoretical predictions.