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A method is presented for analysing over-determined sets of clock frequencycomparison data involving standards based on a number of different referencetransitions. This least-squares adjustment procedure, which is based on themethod used by CODATA to derive a self-consistent set of values for thefundamental physical constants, can be used to derive optimized values for thefrequency ratios of all possible pairs of reference transitions. It isdemonstrated to reproduce the frequency values recommended by the InternationalCommittee for Weights and Measures, when using the same input data used toderive those values. The effects of including more recently published data inthe evaluation is discussed and the importance of accounting for correlationsbetween the input data is emphasised.

Least-squares analysis of clock frequency comparison data to deduce optimized frequency and frequency ratio values