  Observations of the Cosmic Microwave Background (CMB), large scale structure
(LSS) and standard candles such as Type 1a Supernovae (SN) each place different
constraints on the values of cosmological parameters. We assume an inflationary
Cold Dark Matter model with a cosmological constant, in which the initial
density perturbations in the universe are adiabatic. We discuss the parameter
degeneracies inherent in interpreting CMB or SN data, and derive their
orthogonal nature. We then present our preliminary results of combining CMB and
SN likelihood functions. The results of combining the CMB and IRAS 1.2 Jy
survey information are given, with marginalised confidence regions in the H_0,
Omega_m, b_IRAS and Q_rms-ps directions assuming n=1, Omega_Lambda+Omega_m=1
and Omega_b h^2=0.024. Finally we combine all three likelihood functions and
find that the three data sets are consistent and suitably orthogonal, leading
to tight constraints on H_0, Omega_m, b_IRAS and Q_rms-ps, given our
assumptions.
