Mathematics and sophisticated computing applied to Economics. Econometricians crunch data in search of economic relationships that have statistical significance. Sometimes this is done to test a theory; at other times the computers churn the numbers until they come up with an interesting result. Some economists are fierce critics of theory-free econometrics.
Related journals of Econometrics Journal of Global Economics, The Econometrics Journal, Journal of Applied Econometrics, Journal of Econometrics