A least squares analysis is applied to the reduction of complete and incomplete Zeeman patterns. The resulting general formulas provide a simple systematic computation of the "best values" of the Landé g factors and a measure of their precision.
K. L. VANDER SLUIS, "General Formulas for Least Squares Reduction of Zeeman Data," J. Opt. Soc. Am. 46, 605-608 (1956)