On Consistency of Cross-Approximate Entropy in Cardiovascular and Artificial Environments

Table 6

Steps for reliable XApEn estimation.

Step	Explanation
	Choose two time series and specify which one would be master series; define and (preferably ); perform standard scoring of both series.
	Find the differential time series both for master and for follower time series, and calculate their respective standard deviations and .
	Calculate (see (18)).
	Calculate (see (17)).
	Select reliability criterion; a strong criterion requires long data sets, so a weak criterion is suggested.
	Calculate (see (19)), weak criterion (preferably); or calculate (see (20)), strong criterion.
	Estimate XApEn(N, m, ).