003, 2015). For this analysis, we made two different ansatze for the errors. For each peak in the LS periodogram, we evaluate the statistical significance using non-parametric bootstrap resampling. We find using both of these error models evidence for 11/year periodicity in the 90 Sr/ 90 Y data for two of the three samples, but at a lower significance than claimed by Sturrock et al. [1].
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