Single-particle energies was discribed /1/ by analitical expression as function of nuclear parameters A, Z, n, l, J. To produce the expression, the stepwise multiple linear regression was applied to analyze the single-particle energies of protons and neutrons in nuclear along the line of beta-stability.
/1/"Semiempirical formula for single-particle energies of neutrons and protons" M..K. Lodhi, B.T. Waak, J.Comp.Phys. 28 (1978)p 65-81