Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
A, approximate entropy (ApEn). B, sample entropy (SampEn). C, detrended fluctuation analysis scaling exponent α (DFA α). The open symbols represent the maximal test, filled symbols represent the submaximal test.
