How to use RMSD trajectory calculator in VMD?

Hello everyone. I want to calculate MSD using LAMMPS trajectory file. I load dump file named 2.2.Trajectory.xyz and try to calculate MSD, but it seems MSD calculation is not possible because there is no information like mean, standard deviation, min, max, etc. The trajectory file only contains ITEM: ATOMS id mol type q xs ys zs information. Is there any way to solve it?