VSA Hessian Matrix Description

Download Links:

The chi^2 is given by chi^2=-2 log_like= sum_ij (O_i-log(B_i+x_i)) M_ij (O_j-log(B_j+x_j)) where B_i are theoretical bandpowers, x_i are the x-factors and O_i are the observed powers in the offset-log-normal variables (O_i=log(O_i0+x_i)).

A service of the HEASARC and of the Astrophysics Science Division at NASA/GSFC
Goddard Space Flight Center, National Aeronautics and Space Administration
HEASARC Director: Dr. Andrew F. Ptak
LAMBDA Director: Dr. Thomas M. Essinger-Hileman
NASA Official: Dr. Thomas M. Essinger-Hileman
Web Curator: Mr. Michael R. Greason