Total TDEV

We propose an extension of the time variance and its square root, the time deviation denoted TVAR and TDEV, respectively, to improve the confidence of its estimate, taking advantage of information in time series which remains unused by TDEV. The extensions, called the total time variance and the total time deviation, denoted TotTVAR and TotTDEV respectively, use even reflections of the data at the beginning and at the end to almost triple the data length. Computing TVAR of this extended time series significantly increases the equivalent degrees of freedom used in the variance estimate, while producing little bias in the values for phase-modulation (PM) noise types: white PM, flicker PM, and random-walk PM