pomp version 2.4 has been released to CRAN and is on its way to a mirror near you. In this release, the source codes underlying specification of basic model components via R functions has been reworked to remove reliance on deep PROTECT stacks. No changes will be visible to the user. Thanks to Thomas Kalibera for showing the way! Additionally, a bug in the documentation for filter.traj, pointed out by Pierre Jacob, has been fixed.

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This software has been made possible by support from the U.S. National Science Foundation (Grants #EF-0545276, #EF-0430120), by the “Inference for Mechanistic Models” Working Group supported by the National Center for Ecological Analysis and Synthesis (a Center funded by N.S.F. (Grant #DEB-0553768), the University of California, Santa Barbara, and the State of California), and by the RAPIDD program of the Science & Technology Directorate, Department of Homeland Security and the Fogarty International Center, U.S. National Institutes of Health.