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

Table 5

Level of asymmetry of real signals (skewness).

	Rats		Volunteers
	SBP	PI	SBP	R-R
Absolute skewness	0.64 ± 0.86	0.48 ± 1.02	0.42 ± 0.54	0.35 ± 0.33
Portion of signals with negative skewness	36%	24%	46%	60%

Absolute skewness is expressed as ; each signal set comprises a couple of highly skewed signals that influence the standard deviation.