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We present a detailed statistical analysis of the correlation between radioand gamma-ray emission of the Active Galactic Nuclei (AGN) detected by Fermiduring its first year of operation, with the largest datasets ever used forthis purpose. We use both archival interferometric 8.4 GHz data (from the VLAand ATCA, for the full sample of 599 sources) and concurrent single-dish 15 GHzmeasurements from the Owens Valley Radio Observatory (OVRO, for a sub sample of199 objects). Our unprecedentedly large sample permits us to assess with highaccuracy the statistical significance of the correlation, using asurrogate-data method designed to simultaneously account for common-distancebias and the effect of a limited dynamical range in the observed quantities. Wefind that the statistical significance of a positive correlation between the cmradio and the broad band (E>100 MeV) gamma-ray energy flux is very high for thewhole AGN sample, with a probability <1e-7 for the correlation appearing bychance. Using the OVRO data, we find that concurrent data improve thesignificance of the correlation from 1.6e-6 to 9.0e-8. Our large sample sizeallows us to study the dependence of correlation strength and significance onspecific source types and gamma-ray energy band. We find that the correlationis very significant (chance probability <1e-7) for both FSRQs and BL Lacsseparately; a dependence of the correlation strength on the consideredgamma-ray energy band is also present, but additional data will be necessary toconstrain its significance.

The radio/gamma-ray connection in Active Galactic Nuclei in the era of the Fermi Large Area Telescope