In one embodiment, an expression comprising a left-hand side and a right-hand side is received. The left-hand side specifies one or more market instruments, and the right-hand side specifies a method that is to be applied based on the left-hand side of the expression. The expression is parsed. A time series is generated by applying the method based on one or more sets of data values associated with the one or more market instruments. The generated time series is stored in computer data storage.