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We discuss the status of the RBC & UKQCD collaboration's latticedetermination of $\epsilon'$, the measure of direct CP-violation in kaondecays, focusing in particular on recent developments in statistical techniquesfor estimating standard errors and goodness-of-fit metrics for large amounts ofdata that have correlations both in the temporal coordinate and also inmolecular dynamics time. A key result is the formulation of a technique fordetermining the null distribution of a fit using a bootstrap method that isfree from the usual assumptions of independence, large-$n$ and/or normal data,that can for instance be applied to compute p-values even for uncorrelatedfits.

Update on the improved lattice calculation of direct CP-violation in K decays