Multiparameter estimation with the Pseudo-$C_l$ method
Benjamin D.Wandelt (1,2), Krzysztof M. Gorski (1,3,4) and Eric Hivon (1,5)
(1) Theoretical Astrophysics Center, Juliane Maries Vej 31,)
DK-2100 Copenhagen \O, Denmark
(2) Department of Physics, Princeton University,)
Princeton, NJ 08540, USA
(3) European Southern Observatory, Garching bei M\"unchen, Germany
(4) Warsaw University Observatory, Warsaw, Poland (5) Observational Cosmology, Caltech,
Mail Code 59-33, Pasadena, CA 91125, USA

We apply the Pseudo-$C_l$ formalism to obtain an unbiased, approximate method for efficient simultaneous estimation of several cosmological parameters from large, almost full-sky cosmic microwave background data sets.