Moment-ratio kurtosis \(b_2 = m_4 / m_2^2\), where \(m_k\) is the \(k\)-th sample central moment (with divisor \(n\)). This is not excess kurtosis: a Gaussian sample gives values near 3.
Moment-ratio kurtosis \(b_2 = m_4 / m_2^2\), where \(m_k\) is the \(k\)-th sample central moment (with divisor \(n\)). This is not excess kurtosis: a Gaussian sample gives values near 3.