Biases in the Simulation and Analysis of Fractal Processes

Table 1

Mean α estimates (standard deviation in parentheses), computed with the three methods (DFA, PSD, and ARFIMA), from series of series of stride durations, collected during 15 min walking bouts with young (N = 22) and older (N = 23) participants.

		DFA	PSD	ARFIMA
Young	Mean (αDFA) SD	0.878 (0.096)	1.023 (0.137)	0.887 (0.096)
Elderly	Mean (αDFA) SD	0.783 (0.112)	0.951 (0.196)	0.764 (0.088)
	F (1, 43)	9.397	1.999	20.044
		0.004	0.165	0.000
	Partial η^2	0.179	0.044	0.318