Calculation of the Standardised Precipitation-Evapotranspiration Index A set of functions for computing potential evapotranspiration and several widely used drought indices including the Standardized Precipitation-Evapotranspiration Index (SPEI). Software Depends: lmomco Santiago Beguería <santiago.begueria@csic.es> Santiago Beguería <santiago.begueria@csic.es> and Sergio M. Vicente-Serrano <svicen@ipe.csic.es>. GPL-2 2012-03-21 application/tgz http://CRAN.R-project.org/package=SPEI