Formula 1 REA=1T∫0Tr2(t)dt⇔1N∑i=1NR E A=\sqrt{\frac{1}{T} \int_{0}^{T} r^{2}(t) d t} \Leftrightarrow \sqrt{\frac{1}{N} \sum_{i=1}^{N} }REA=T1∫0Tr2(t)dt⇔N1i=1∑N