The statistical analysis of irregularly space data or the handling of series with missing data asks for particular care because results may be biased. In particular, in PTTI applications, two points seems to be addressed: centre dot the noise analysis in terms of Allan or related variances; centre dot the estimation of a missing datum on a particular date. Both these issues are examined in the particular case of the current TWSTT measurement, by means of an analytical and theoretical approach that can be of more general interest. Some numerical estimates based on the TWSTT measures are eventually reported.
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