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extended in time. For this reason we repeated the analysis using only portions
of the series, obtaining the same results. Another, more interesting, source of
non-stationarity could be a strong correlation among the series of the trigger-
ing processes, namely the condition (rm "r}m) i (y[]) 2. It is interesting to
notice that also this condition might reflect a form of predictability to assess
through a properly tailored form of statistical analysis of time series. We leave
this as a subject of further investigation.
PG thankfully acknowledges the Army Research Office for financial support
through Grant DAAD19-02-0037.
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