A multi-factor model uses many factors in its computations to explain market phenomena and/or equilibrium asset prices.

Correlation is a statistical measure of how two securities move in relation to each other. Investors use correlation to diversify their portfolios and hedge against risk.

The performance of a turbine using this stabilised self-acting variable pitch system has been modelled using an extended double multiple stream tube approach adapted to variable pitch systems.

That conclusion is based on research using the Drake equation: a formula with seven variables that explores the chance detectable extraterrestrial civilizations exist.