Wave functions for the thirteen electron groups of ytterbium have been calculated in the nonrelativistic approximation without exchange. Certain innovations in the numerical procedures are described and discussed. In particular, the use of backward integrations is essentially eliminated from the procedure for determining the energy-related eigenparameters. Wave functions are tabulated for the outermost four subshells, and Slater integrals for the 4f group. The 4f146s2 configuration is assumed.