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Table 3 Hjorth parameters

From: Feature ranking and rank aggregation for automatic sleep stage classification: a comparative study

Feature name Formula
Hjorth activity σ 20
Hjorth mobility σ 1/σ 1
Hjorth Complexity \( \sqrt {({{\sigma_{2} } \mathord{\left/ {\vphantom {{\sigma_{2} } {\sigma_{1} )^{2} }}} \right. \kern-0pt} {\sigma_{1} )^{2} }}} - \left( {{{\sigma_{1} } \mathord{\left/ {\vphantom {{\sigma_{1} } {\sigma_{0} }}} \right. \kern-0pt} {\sigma_{0} }}} \right)^{2} \)