Some fundamental factors influencing retention indices in gas-liquid chromato raphy are studied by the mathematical technique offactor analysis. Eight abstract eigenvectors are required to span the factor space and to reproduce the data matrix within experimental error. A scaling-test vector termed the uniqueness test is used to compare compounds in the scheme. A procedure is presented for accurately predicting a solute retention index on any stationary phase in the system if the retention indices of that solute on eight carefully chosen stationary phases are known. The procedure can also be used to predict retention indices of any solute in the system on a given stationary phase if the retention indices of eight chosen solutes on that column are known. The usefulness of this procedure for predicting retention indices is illustrated for four solutes which were purposely left out of the analysis. Using the rotation part of the factor analysis, the following solute physical parameters tested successfully as factors of the space: molar polarization and dipole moment squared.A solvent property which tested successfully was the uniqueness of etherlike linkages.

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