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Estimates of the fractal exponent using PG, AF, and DFA methods, evaluated as a function of sample size. Error in the estimate is expressed as the difference between the estimated value and the expected value, taken as absolute value. This test is limited to the simulations with parameters α = 1 and a f = 15%, the case assumed as most physiological. Sample size is varied as follows: N = 500, 1000, 2000, 5000, 10000.
