\[begin{array}{l} Arms{\text{ }}Index{\text{ }}or{\text{ }}Short{\text{ }}Term{\text{ }}Trading{\text{ }}Index,{\text{ }}TRIN = {\text{ }}\ \left( {{\text{ }}\frac{{Number{\text{ }}of{\text{ }}advancing{\text{ }}Issues \times Volume{\text{ }}of{\text{ }}declining{\text{ }}issues}}{{Number{\text{ }}of{\text{ }}declining{\text{ }}issues \times Volume{\text{ }}of{\text{ }}advancing{\text{ }}issues}}} \right) end{array}\]