Likelihood Code

The data made available through this page has been updated. The most recent version of this data may be accessed through https://lambda.gsfc.nasa.gov/product/wmap/current/

Proper assignment of errors to points in the CMB angular power spectra requires the use of a Fisher matrix. Since some components that go into making the Fisher matrix are model dependent, we provide FORTRAN90 code which, given an input CMB model power spectrum, will compute the likelihood of that model fit to WMAP data and optionally return the Fisher matrix.

More details can be found in:

"First Year Wilkinson Microwave Anisotropy Probe (WMAP) Results:
The Angular Power Spectrum", Hinshaw, et al., 2003

"First Year Wilkinson Microwave Anisotropy Probe (WMAP) Results:
Parameter Estimation Methodology", Verde, et al., 2003

WMAP Explanatory Supplement

Release Notes:

Version 1.0, 2/11/2003:
Initial release.

Version 1.1, 2/21/2003:
Fixed a bug in code that reads in the off-diagonal elements of the TE covariance matrix. Users report that this bug had a minimal effect on likelihood analyses and does not warrant re-running of previous results. Additional comments also included.
Thanks to Paul Steinhardt and Antony Lewis for bringing this to our attention.