DSGE Modeling on an iPhone/iPad Using SpaceTime

SpaceTime 4.0 is cross-platform mathematics software available for the iPhone/iPad under iOS, as well as other devices. It can be used to implement usable DSGE modeling tools; this includes the solution of linear rational expectations, solving optimal linear-quadratic policy problems, obtaining automatic first- and second-order approximations, scenario simulation and graphing. These analytical tools are easily programmed into a library of routines that can be quickly applied to arbitrary models, making an iOS device a viable platform for useful analysis. As there are limitations on the numerical routines available, a method for solving singular models without using the QZ decomposition is also derived. Copyright Bank of England 2012