Table 2.

D ₂ estimated by different approaches for Lorenz attractor series (5000 samples) and HRV signals (300 samples). Data expressed as median ∣ interquartile range.

	Lorenz	HRV
		Hyp	NoHyp	P value
D 2 [10]	1.93	5.92∣0.57	4.39∣1.26	0.028
${\widehat{D}}_{\mathrm{2}}$	1.93	5.94∣0.60	4.81∣0.79	0.028
${\widehat{D}}_{\mathrm{2}(\perp )}$	2.01	6.41∣0.65	5.11∣0.77	0.028
${\widehat{D}}_{\mathrm{2}(\max )}$	1.93	5.88∣0.49	4.83∣0.70	0.010